Help for update permissions of an app

[Rom]

Hello,

i would to update the permissions of an app,
I have propeply decompile it, it originally work on JB, it works on LP too but not on MarshMallow.

Anyone can help me to update it ?
I see this guide but i don't have enough knowledges in this case..
http://developer.android.com/training/permissions/requesting.html

Thanks.