Play Computer - Custom Position

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mikey53bye
In Play Computer, I'm trying to start a few moves into an opening I'm studying. so I select Custom Position, move the pieces for both sides until I get the position I want, but then I can't figure out how to get the computer to continue.
mikey53bye

Sorry, I meant for this to be in Help & Support. I just repeated this post in H&S but can't figure out how to delete this post.