How do I factory reset my T-Mobile LG G Slate? I forgot the password and i cant access the

[AC Question]

I've had this G-Slate for a while but I forgot the password for it. I want to reset it so I can get back in but I cant access the "settings" tab without the password. Help is greatly appreciated.

 

[Rukbat]

Either Android Device Manager or bring it (and a picture ID) into a TMobile store.