Override Templates

Thanks for your quick reply,
Actually I’m not very good at WP hooks and filters (but trying to figure them out!), I’ve read the well explained documentations and have tried to use filters and hook to following function, but didn’t work (probably the lack of WP filtering and hooking knowledge), so knowing it might be out of your support zone, would be great if you help me how can I edit following function through my functions.php file.

function give_output_levels( $form_id ) {

	//Get variable pricing
	$prices             = apply_filters( 'give_form_variable_prices', give_get_variable_prices( $form_id ), $form_id );
	$display_style      = get_post_meta( $form_id, '_give_display_style', true );
	$custom_amount      = get_post_meta( $form_id, '_give_custom_amount', true );
	$custom_amount_text = get_post_meta( $form_id, '_give_custom_amount_text', true );
	$output             = '';
	$counter            = 0;

	switch ( $display_style ) {
		case 'buttons':

			$output .= '<ul id="give-donation-level-button-wrap" class="give-donation-levels-wrap give-list-inline">';

			foreach ( $prices as $price ) {
				$counter ++;

				$output .= '<li>';
				$output .= '<button type="button" data-price-id="' . $price['_give_id']['level_id'] . '" class="give-donation-level-btn give-btn give-btn-level-' . $counter . ' ' . ( ( isset( $price['_give_default'] ) && $price['_give_default'] === 'default' ) ? 'give-default-level' : '' ) . '" value="' . give_format_amount( $price['_give_amount'] ) . '">';
				$output .= ( ! empty( $price['_give_text'] ) ? $price['_give_text'] : give_currency_filter( give_format_amount( $price['_give_amount'] ) ) );
				$output .= '</button>';
				$output .= '</li>';

			}

			//Custom Amount
			if ( $custom_amount === 'yes' && ! empty( $custom_amount_text ) ) {
				$output .= '<li>';
				$output .= '<button type="button" data-price-id="custom" class="give-donation-level-btn give-btn give-btn-level-custom" value="custom">';
				$output .= $custom_amount_text;
				$output .= '</button>';
				$output .= '</li>';
			}

			$output .= '</ul>';

			break;

		case 'radios':

			$output .= '<ul id="give-donation-level-radio-list" class="give-donation-levels-wrap">';

			foreach ( $prices as $price ) {
				$counter ++;

				$output .= '<li>';

				$output .= '<input type="radio" data-price-id="' . $price['_give_id']['level_id'] . '" class="give-radio-input give-radio-input-level give-radio-level-' . $counter . ( ( isset( $price['_give_default'] ) && $price['_give_default'] === 'default' ) ? ' give-default-level' : '' ) . '" name="give-radio-donation-level" id="give-radio-level-' . $counter . '" ' . ( ( isset( $price['_give_default'] ) && $price['_give_default'] === 'default' ) ? 'checked="checked"' : '' ) . ' value="' . give_format_amount( $price['_give_amount'] ) . '">';

				$output .= '<label for="give-radio-level-' . $counter . '">' . ( ! empty( $price['_give_text'] ) ? $price['_give_text'] : give_currency_filter( give_format_amount( $price['_give_amount'] ) ) ) . '</label>';

				$output .= '</li>';

			}

			//Custom Amount
			if ( $custom_amount === 'yes' && ! empty( $custom_amount_text ) ) {
				$output .= '<li>';
				$output .= '<input type="radio" data-price-id="custom" class="give-radio-input give-radio-input-level give-radio-level-custom" name="give-radio-donation-level" id="give-radio-level-custom" value="custom">';
				$output .= '<label for="give-radio-level-custom">' . $custom_amount_text . '</label>';
				$output .= '</li>';
			}

			$output .= '</ul>';

			break;

		case 'dropdown':

			$output .= '<select id="give-donation-level-' . $form_id . '" class="give-select give-select-level TEST">';

			//first loop through prices
			foreach ( $prices as $price ) {

				$output .= '<option data-price-id="' . $price['_give_id']['level_id'] . '" class="give-donation-level-' . $form_id . '" ' . ( ( isset( $price['_give_default'] ) && $price['_give_default'] === 'default' ) ? 'selected="selected"' : '' ) . ' value="' . give_format_amount( $price['_give_amount'] ) . '">';
				$output .= ( ! empty( $price['_give_text'] ) ? $price['_give_text'] : give_currency_filter( give_format_amount( $price['_give_amount'] ) ) );
				$output .= '</option>';

			}

			//Custom Amount
			if ( $custom_amount === 'yes' && ! empty( $custom_amount_text ) ) {
				$output .= '<option data-price-id="custom" class="give-donation-level-custom" value="custom">' . $custom_amount_text . '</option>';
			}

			$output .= '</select>';

			break;
	}

	echo apply_filters( 'give_form_level_output', $output, $form_id );

}

Thanks and have a great time