SSH to your aTV:http://support.firecore.com/entries/316002-connecting-via-ssh-and-sftp
go to /VAR/STASH/APPLICATIONS/LOWTIDE.APP/APPLIANCES
now just delete anything that you dont want anymore
if you have Overflow install just go to Overflow settings and restart lowtide to reboot
Or you can just use terminal (killall Lowtide) to reboot also.
Wanted to share this because I made the mistake of installing NitoTV MainMenuWeather and didnt like it.