Can someone help me make a sub-page?

The page itself doesn't really matter. It's actually the sub-thread in the comments that notifies your subbers. Though a lot of people go all-out on their sub-pages, you could just write your name and "post a period in the sub-thread to subscribe" on it and you're good! :D

Basically a good subpage needs how to sub, maybe about and maybe benefits. To make buttons we can use the simple if () {} statements and for the instructions and other stuff you just use a text function and \n for breaks and \t for tabs. The rest of it Ruby Phoenix already explains. If you need more help you can ask me. Good luck on the sub page.

I can help if you want 

The point of KA is to learn why don't you try making one yourself