Someone please help!! :(

I have been scanning the Internet for a week and watched hundreds of youtube videos about this and I cannot for the life of me solve it!! So I'm trying to use a mock gps app for pokemon go. I live in a remote area with nothing but trees and the town is an hours work. I've had it for a month now and I'm still only level 2. I'm trying to use the app to catch some pokemon. All the YouTube videos say I need to "un tick allow mock location" this option is nowhere to be seen on my phone. Someone please help! I have screenshots but unsure how to post pictures on here

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