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Frank,
OAG's must be set up and focused during the day. It's 100% easier focusing on a distant object in both the imaging camera and the guide camera.
The trick is to set up with the imaging camera in focus, and DON'T move it or the telescope focuser - don't touch it!
Then, using spacers, extension tubes, whatever it takes, bring the edge ( as the prism only sees the extreme outer edge of the FOV) into focus with the guide camera. using an eyepiece may give you a good starting point.
I find that it's better to have the OAG body at the top ie in dec so you can slightly move the scope with the fine controls to "ease" the target object into the guide field. Definately a fiddly first time set-up, but if nothing is subsequently moved it will be ready for the next session.
BTW Just double check the prism in the Orion is properly positioned - looking directly forward..there's a sneaky little grub screw which sometimes can come loose and let the prism rotate.
HTH
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