Let me know how I can do this, it’s nearly impossible to back out this is rediculous.
What do you want to unsubscribe from? If it's a product, you can just uninstall it, but if you want to have your account deleted, you will need to contact Support:
Contact Support by Phone or Chat
If you want to remove your forum account, you will need to contact one of the Admins, such as @Laksh or @Ben.
As Simon has mentioned, please let us know which F-Secure account are you referring here.
If it is the F-Secure community account, please follow the instructions here if you would like to close your community account.