How do I stop WP from stripping HTML in Edu Clean's Service Settings?

One of Edu Clean’s theme options is a Featured Block Style called Service Mode, which allows me to add a few linked thumbnail and short descriptions. These all show up on my front page. It’s a wonderful idea…except that WP strips the HTML from my descriptions.

The default short descriptions contain hard-coded relative links like this:

<a href="wp-admin/themes.php?page=custom-homepage.php">upload and crop new images</a>

I want to add my own links. I tried adding an internal absolute link, but WP just strips out the HTML.

How to I trick WP into letting me include links…hopefully without hard-coding?