Using the WEB IDE
If you are not familiar with Git, editing your website using the Web IDE is a simple way to update your website.
From the Gitlab website click on the Projects link in the sidebar, or use the following link https://gitlab.grit.ucsb.edu/dashboard/projects
In your project, use the file view, to find the file you want to edit, and then click on the file. 
Once you have selected the file, click Edit, and then Open in Web IDE, or Edit single file.
Once you are done editing files, click the Source Control icon (Commit changes when editing a single file)
In the text dialog, you can write a brief description of your changes (or leave it blank), and click Commit and push to 'main'
Once this is done, your page should build. It might take a few minutes for the changes to show up on your website.