You have two methods, the first one it’s connecting a wallet through NWC for fast zaps.

The second is a bit more clunky, basically keeping the zap button pressed, it will open the zap window and redirect you to your wallet like WoS or similar.

If you do not see the zap button, go to settings and in the “reaction” tab (I’m following my memory here, so it could be a little different) add the ⚡️ emoji and it should add it!