2ways. But im doing Invisonfree.
Invison Free
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go to invisionfree.com
After you click Register you will full out your information and then they will give you 2 links click the first one and you'll see your website it will look like this.
After this backspace to the 2 links and click the admin control panel one and log in on the side you will see all these differnt sections. Scroll down till you fine these two
Now click the one that says New Category, heres an example of what it should look like.
After you have compleated the Category name go back to the home of
the admin control panel and click new forum.
After you make the name of the forum you scroll down and you'll see these permission.
Set them exactly as I did accept the banned forum mask set that the same as guest. Sorry I made a mistake =(
Now after you done that if u go back to the page of your site it will look like this.
Now you have a website but you have a big long adress now go to
www.web.com
Click the register button and you should get a page like this

Now after you have done that part you will get another page which you fill out and the differnt payment methods, the top of the page will look like this