Click the New Issue button and you'll arrive at the Create an issue screen. This has a variety of fields that you can fill in to report on a problem or desired change in the GitLab project:
Let's fill out an issue. I think we should probably be using Composer (https://getcomposer.org/) to manage this PHP project, which is a perfect candidate for this. Click the Assign to me button as well so that we can get started on this issue shortly, and then hit Submit issue:
Something that's interesting to note is the ability to use ...