Remove "Provided by WPMU DEV - The WordPress Experts" Edu Clean

I'd like to do two things.

1. Add navigation links in the footer.

2. Remove "Provided by WPMU DEV - The WordPress Experts" but leave the nav back to the top. Tried on my own with limited skills and broke it every time.

Here's the relevant part of the footer.php file

<div id="incsubfooter">
<?php _e('Provided by', TEMPLATE_DOMAIN); ?> <a href="https://premium.wpmudev.org" title="WordPress plugins, themes and support"><?php _e("WPMU DEV - The WordPress Experts",TEMPLATE_DOMAIN); ?></a>  |  <a href="#top-bar"><?php _e('Go back to top ?', TEMPLATE_DOMAIN); ?></a>
</div>