42 Help me!!!

How do I create a volume on my phone?!?!?! I'm almost done with my chapter but this is fustrating me.

please anybody who knows can you tell me... or else I'll have to wait till Monday to post...

Ps- thanks for the ratings, it's appreciated.

next is gifts and vouchers lol im just kidding. I don't think the book will get that far in supports. anyway please help me with the volume.thing on my phone app it's a huge pain in my ass.