I have a 13th Gen DIY and am installing the memory but the main board informational sticker is the full width of both memory slots.
The official guide and videos I looked at it didn’t show this, do I just take some scissors to it? Is it meant to stay in place and they just go below it?
Just go below it…there shouldn’t be anything you need to cut to build it
If you mean the mylar flaps that cover both RAM slots, then yes just flip them out of the way when you install the ram. The flaps should cover the sticks. These covers are present on 13th gen/AMD and Chromebook mainboards, and the guides are probably using 11/12th gen so they aren’t there.