1. Make sure you're running PR1.3, Nokia's last official Maemo 5 update. To see if you have PR1.3, go into Settings > About product, you should see under Version it has the numbers beginning with 20.2010.36. 2. Click on the Install testing button above. (use http://j.mp/communityssu as a quick link to this page from your Nokia N900) 3. Hildon Application Manager (HAM) will launch and appear to be doing nothing but after a second or three it will display the first installation, so be patient. In all, there are a series of installations for which HAM will prompt you with messages and warnings. Click "accept" and "done" for each and let HAM install all the community packages. 4. Once done (ie. no further install prompts appear after some while), close HAM and go into the applications menu. Look for Community SSU and launch it. This will then automatically run through a series of scripts to ensure HAM will now be using community repository for updates. 5. HAM will re-open and present a system upgrade called Maemo 5 Community SSU. Once installed, your device will reboot.