Rich Text Box

Thanks for the inquiry. This is on our wishlist of possible future updates.

Replace

<label for="sheet_details">Details:</label><br />
                    <textarea id="sheet_details" name="sheet_details" style="width: 100%;" rows="3">'.((isset($f['sheet_details']) ? esc_attr($f['sheet_details']) : '')).'</textarea>
                </p>

with

<label for="sheet_details">Details:</label><br /> ';
			$textarea_name = 'sheet_details';
		   	wp_editor('','sheet_details', $textarea_name );
	echo '
                </p>

in sign-up-sheets.php (around line 723)