You have to get in there and a get a good look to see what the end of the tab looks like. On some cases the end will have an offset to lock it inplace where you would need to push on it sideways a little and lift up from there.
Sometimes those are beveled a little with tempered angles on all four sides where it is press fitted down inplace during the initial assembly. After a few times you may find that it will tend to loosen up a bit as well.