So can i use this account which i have created to post on the forum freely?
No, that is ban evasion and is against the rules.
If you have been banned permanently, you aren't supposed to be using the forum under any account.
Perma ban = you cannot ever use an account on the forums again unless it is changed.
Each time you register another and are caught it is additionally looking bad and will lessen your chance of ever being unbanned. Your best option OP is be honest, don't pretend you did not know about evade. PM a admin apologizing and say you will come back in a few months and see if they will forgive you.
If you are not ban evading and give it a few month's and come and ask admin for unban they might do it. But it is not guarenteed.