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If you have at least one repository (besides the default) installed: Select the repository you wish to install from.
Select the category the addon belongs to, in this case it should be video.
Select uiiumovies - XXX.
Installing via directory means you connect to a Web server directly using Kodi. It also means that the addon is found under a repositry or a sub-repository you install from that directory (check out which repositories host uiiumovies - XXX addon below).
Open up Kodi and navigate into the System settings screen by selecting the cogwheel button (above the side-menu inside Kodi's home-screen).
Select File manager.
Select Add source from the left pane (the right pane is in case you want to move files from one folder to another, if you're using a mouse you may need to double click it).
Click the line where it says <None> and enter the following url: https://mrgsi.github.io/gsource/ Note: some servers may be case-sensitive.
click OK after you are done typing.
Below that, if there isn't already, enter a name for the source which will be easy for you to recognize in the future. Click OK
Now press the return button twice to return to home-screen. Navigate into Add-ons.
Click the open box icon (above the side-menu).
Select Install from zip file.
If this is the first addon you install, Kodi will warn you about installing addons from "unknown sources" for security reasons - it's your call.
In any case, Kodi will warn you, you may not get auto-updates for this addon.
Look for the name of the source as it was entered in step 5, select the repository zip file you see inside it. That's it. The rest of the instructions are as detailed in installing Via Repository, use the repository you've just installed.