It is actually easy and with some database understanding extremely quick! All you need to do is make a backup of your theater settings from the settings menu of the posterwall. -Start posterwall and navigate to settings>library>Backup&Reset. - Save the file to a location of your choice (preferably a location you can then access with your computer) - Then unzip your backup file (!don't forget that step) - once unzipped you will find a folder named databases > open it - you will then see the theater.db file open the theater.db file in a database editing software of your choice and you have full direct editing abilities of your posterwall Then you simply re-zip the file (make sure the file ending is .tzb) finally use the file to restore the library in posterwall>library>Backup&reset Enjoy !
Sorry but i don't understand, edit the poster wall how? And why do you feel like you have to edit it?