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If it's similar to my Meade and Celestron guide eyepieces then before you put the eyepiece into the scope, just look into it and adjust the top "ring" to reach best focus on the internal cross-wire. Don't touch the ring again...
Then insert the guide eyepiece into the telescope and use the normal focuser (like you would do an normal eyepiece) to bring the target into focus.
At this stage the cross-wires should be clearly visible and focused on the target.
Hope this helps.
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