Add field textarea module Users

add_action( 'show_user_profile', 'show_profile_fields' );
add_action( 'edit_user_profile', 'show_profile_fields' );

function show_profile_fields( $user ) { ?>

<h3><?php _e("More Information") ?></h3>

	<table class="form-table">

		<tr>
			<th><?php _e("Research Interests:"); ?></th>

			<td>


			<textarea name="interests" id="interests" class="regular-text" cols="30" rows="5">
<?php echo esc_html(get_the_author_meta('interests', $user->ID) ); ?>
</textarea><br />
<span class="description"><?php _e("Enter your Research Interests. Separate with commas"); ?></span>



			</td>
		</tr>

	</table>
<?php }

add_action( 'personal_options_update', 'save_profile_fields' );
add_action( 'edit_user_profile_update', 'save_profile_fields' );

function save_profile_fields( $user_id ) {

	if ( !current_user_can( 'edit_user', $user_id ) )
		return false;

		update_usermeta( $user_id, 'interests', $_POST['interests'] );
}