Go to edit favorites list>select favorites list. This should give you the systems to select, (next line down in the left column) select the system.
The right side of the page should show departments, sites, Unit ID's, select that then hit the + key and you should be able to add unit ID's in whatever format you selected, you can also switch this back and forth. This is how you add (or edit) a UID name and save as well.
I have over 1K of ID's saved on one system so far.