How to stack...

Good evening,

Lately I've been working on learning how to incorporate the "stack" feature into our church services.  I'm not sure if I'm doing something wrong, but I'm unable to activate the "rec sel" button.  I've read the manual on stacking but still can't get that button activated.  The stack button works, but according to the manual I need to click on "rec sel" first.  Does anyone have any idea why this is happening?  Do I have to do something before I can req sel?  

PS: I'm trying to get memories to stack.

Thanks

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