MyBB Community Forums

Hey everyone, sorry to bother you all, but I have been trying to upload the forum file onto my weebly website. I have a pro account and I used to be able to do everything as google seemed to be my friend. But for some reason I am having problems uploading the files onto my site.
I know it can be put onto weebly sites as I found one with it on.
Apparently weebly do not support php files? 
If this is the case how was the other website able to instal the forum onto their page and how do I overcome this wee problem.

Thanks in advance guys 

Just for reference (this link is not my site I am still in the final stages of editing my site ready for it to be published but just want to give an example of a weebly site with the forum on it!!)
http://reliablechristian.weebly.com/forums.html

That site is using a iframe to load the forum.
The forum itself is located at http://reliablechristiansupport.tk

Yes, Weebly seems to be a website builder service, not a hosting provider. You'll need to find actual hosting to run a forum on.