You need to go to the vessel select menu (press F3), and then just double click on the name of the thing you want to select. UMMU people and cars are 'vessels', so they behave basically like any other spacecraft in the game.
UMMU works fine with Orbiter 091124. I haven't used UMMUs and UCGO much, so I won't give you more detailed instructions, than those below, but I can assure you they work with Orbiter 2009.
If UMMU is in the vessel you need to do EVA first to control "it". Usually selecting person is done by pressing keys "1" and "2", and EVA by pressing "E". Then, you can select UMMU from vessels' dialog box, and when inside UMMU, you can press "H" for further help.
If you mean UCGO cars, then if one is packed, it is non-focusable, and you need to unpack it first to use it - "U" key when you are near it with the UMMU. Further help you can get inside a car by pressing "H" key.
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