Using template tags in pages/posts?

No it’s not. The template tags feature was built for the myCRED Log.

But you can add support for your post/page content:

add_filter( 'the_content', 'add_template_tags_in_content' );
function add_template_tags_in_content( $content )
{
	// Load myCRED
	$mycred = mycred_get_settings();

	// Add support for General template tags:
	$content = $mycred->template_tags_general( $content );

	// Return the results
	return $content;
}

You can find a complete list of methods you can use though the mycred_get_settings function.