Hi Joshua,
Any UltraCommunity extension is just like a regular WordPress plugin and the installation is almost exactly the same process. Once the extension is downloaded you can follow the steps below:
Go to Dashboard -> Plugins -> Add New
Choose the “Upload” option located at the top of the page
Click “Choose File” and navigate to the “zip” file you’ve downloaded
Click “Install Now”
After the installation finishes, click “Activate”