How can you register after banned?
You can change your ip address. Visit from another ip and register the account. Whenever you want to login to that forum or website hide ip address in simple way.
Don’t use your old mail id or any other old details. Create new one.
For Multiple Accounts:
If you want multiple accounts in forum ,what you have to do? First register one account with one ip. Then register another account with another ip. likewise do registration. If you want to login ,follow same procedure and use unique ip address for each account.
How to change ip address?
I gave you list of proxy servers here: Proxy Server ip address list
Use those proxy server.
If you don’t know how to use those proxy server ip address ,please read this tutorial: How to use proxy to change ip address?
After setting new ip,check whether it is working or not by visiting “whatismyipaddress.com”. If the above proxy list didn’t work,then try to search in google as proxy list”. I hope above proxy lists will work perfectly.