If it's from iTunes, go into iTunes and uncheck the app and sync, that should remove it. If it's from Cydia you have two choices, download "CyDelete" from Cydia and it will give you the "X" to delete apps,, just like normal. Or, you can go into Cydia under "Manage", select "Apps" goto the app and tap on "Modify" and tap "Remove". CyDelete is the best way, works with all Cydia apps, except the Cydia app it self.