Editing Playback name(s) on ColorSource 20/40

I just received my ColorSource 20/40 and was setting everything up.  I was assigning lights/dimmers to my different playbacks and somewhere in the process I named the first playback.  However, when I touch Playbacks at the top of the touch screen and it shows the names of all the playbacks, they're ALL named what I named the first playback.  I cannot seem to get to how/where I can re-title the others appropriately.  I do not see it in the manual either.  Anybody have the answer??

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