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If it's anything like the 9343 model from 2015, a T5 Torx driver and a wedge tool can pop it open. I swapped the Broadcom card for an Intel 7620 in mine.

https://www.ifixit.com/Teardown/Dell+XPS+13+Teardown/36157

+1 on this. If you get the Broadcom card in your Dell, replace it ASAP. It can cause so many issues but it's really easy to replace. Costs around $40 including the torx driver and takes under 10 minutes.

The broadcomm DW1560 is the currently recommended card.

There are numerous guides on replacing the wifi card in the dell, ifixit has guides. And because this isn't apple, the laptop has a upgrade/repair/owner's manual (online).

The WiFi card is a simple mPCIe card. You can just switch that out.