Problems locating the external spool filament change

I have spent hours trying to figure out why I was getting mismatches eventaully found the solution on Reddit. I have clicked on the black box many times but failed to hit the little ‘tick’; Can you make the target area bigger an add a pop up? Unless you know its there its very hard to find -Thanks

That isn’t a tick, it’s the universal symbology for “edit” - it’s a pencil and paper.

Pic,nic.