It's released under CC Attribution-NonCommercial-ShareAlike license, so you have permission to edit this template, share a derivative work from the template as long as it's also free, and publish a noncommercial product using the template. You can ask for permission to publish a commercial comic using this template by asking me, preferably by e-mail! You do not have permission to sell a derivative version of the template itself, however.
This page has all the documentation to get you started on formatting your webcomic, along with an outline of the features. So, let's dive in...!