The cover pulls off. Just inspect it closely and you’ll see. The replacement bulb number will be stamped into base of an existing bulb. To remove a bulb, push in slightly and turn then it’ll come out. It’s quite likely that it is bulb 1157 (mine are and it’s a common bulb for this application). The bulbs usually come in two packs so I replaced both on our pop up when one went out. I figured the other was soon to follow.
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