They pop out, by applying pressure from the back of the triangle. It is "usually" a pressure fit.
I found a little lubricant will help [WD-40].
The upper corner has a little lip which you will need to be careful with during the removal process.
It is basically slide and push; CAVEAT - be very careful with the tab edge. If worst comes to worst, you can super glue the little tab back on, but I have used them without the slide tab.
Scott
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