doc: add simpler instruction to get started with testing

README.md

@@ -18,7 +18,7 @@ npm install
 npm run build:web:serve -- --test
 ```
 
-To be able to make submissions: go to "profile" (bottom left), go to the bottom and expand "Show Advanced Settings", go to the bottom and to the "Test Page", and finally "Become User 0" to see all the functionality.
+To be able to take action on the platform: go to [the test page](http://localhost:8080/test) and click "Become User 0".
 
 See [BUILDING.md](BUILDING.md) for comprehensive build instructions for all platforms (Web, Electron, iOS, Android, Docker).