README: how to log out and uninstall

README.md

@@ -63,6 +63,22 @@ That's it. Pi remembers your key and your last model for next time.
 pi update --extensions
 ```
 
+## Logging out and uninstalling
+
+**To remove your API key,** type `/logout` and choose uniGPT. The uniGPT
+models disappear from `/model` until you log in again. The key itself stays
+valid; to revoke it, contact the uniGPT team.
+
+**To uninstall the extension,** log out first (uninstalling does not delete
+the saved key), then run:
+
+```sh
+pi remove git:imsc.uni-graz.at/git/behackl/pi-unigpt
+```
+
+If you made uniGPT your default, also remove `defaultProvider` and
+`defaultModel` from `~/.pi/agent/settings.json`.
+
 ## Things to know
 
 - **The thinking level setting has no effect.** uniGPT decides how much each