adding some code

Hello, THANKS FOR ALL HELP !

I need to add some “text” below some input fields, BUT i’m not expert in html, CAN SOMEONE TELL ME WHERE TO ADD IT ?
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</div><!–End Price Heading –>
<div class=”large-6 medium-6 columns”>
<div class=”inner-addon left-addon”>
<i class=”icon fa fa-money”></i>
<input type=”text” id=”post_price” name=”post_price” placeholder=”<?php esc_html_e(‘Sale Price’, ”) ?>” size=”12″ class=”form-text required input-textarea half” required>
</div>
</div><!–End Price –>
<?php $saleprice= $redux_demo[‘regularpriceon’]; ?>
<?php if($saleprice == 1){?>
<div class=”large-6 medium-6 columns”>
<div class=”inner-addon left-addon”>
<i class=”icon fa fa-money”></i>
<input type=”text” id=”post_old_price” name=”post_old_price” placeholder=”<?php esc_html_e(‘Regular Price’, ”) ?>” size=”12″ class=”form-text required input-textarea half”>
</div>
</div><!–End OLD Price –>
<?php }?>
<?php $phoneon= $redux_demo[‘phoneon’]; ?>
<?php if($phoneon == 1){?>
<div class=”large-6 medium-6 columns end”>
<div class=”inner-addon left-addon”>
<i class=”icon fa fa-phone”></i>
<input type=”tel” id=”post_phone” name=”post_phone” placeholder=”<?php esc_html_e(‘Phone Number’, ”) ?>” size=”12″ class=”required”>
</div>
<p class=”help-block”><?php esc_html_e(‘חשוף לכל הגולשים’, ”) ?></p>
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I MEAN LIKE THE “HELP-BLOCK” = חשוף לכלל הגולשים

BUT I NEED ALSO UNDER THE PRICE FIELD

1. So, how can i add this ? and set the size of the fonts ?

2. Also in the INPUT field the font is differnet from the REGUALR THEME, how to change the DISPLAY FONT in the INPUT FIELDS ?