Question Problem with size

Hello I dont know if I posted in right categorie, I have problem with size of youtube videos , code box and everything that is connected to the code, since my forum is in template I had to descrease the size, Now I uploaded few pictures to see what I am talking about , everything is tiny , video, code box, banner, I took picture of configuration , dont know if have to change something in css file, if someone knows what to do plz help, thx. And last question how to remove Forum tools above username on my forum its always opened I would like to delete it or to be hiden like here.

It's your Joomla template. Need a link to the site to see.

its www.zerobeats.com/index.php

"This forum is open only to registered and logged-in users.
If you are already registered, please log in first."

username and password: guest

Where is the post with the video problem? Also that AHA template is causing other issues with your forum tools menu PLUS you have the forum crammed into too narrow of a space. Maybe unpublish some modules on the right or left sides.