How to delete or move a guide on the screen

OK. I give up. I put two guides on a Lectora screen and now all I can is show hide them. I can't move them or delete them. All I can do is add more guides. I've tried left-clicking, right-clicking, click-and-drag, etc., and nothing seems to work. They are driving me crazy! Can someone please, please, please tell me how to edit guides once they are on the screen? Please don't let me become a statistic of death by Lectora guides. :-)

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