I just installed Scrabble this morning.
Firstly, you'll need a jailbroken phone.
Then:
1. Use WinSCP or similar to access the phone.
2. Navigate to the Applications folder.
3. Having unzipped the Scrabble download, copy the scrabble.app folder into the applications folder on your phone.
4. Change the permissions on 4 files in the scrabble.app folder to 0755. The files have extensions .plist and .
js, from memory. (the files are obvious - you don't have to change permissions on the png files)
5. Restart your phone.
If you are unsure about using WinSCP and changing permissions then search elsewhere. I've been deliberately vague as a little knowledge can sometimes be harmful to your iPhone!
When Scrabble appears on installer it'll be much simpler
