Answer
permanently delete my Facebook account on my computer follow the instruction below:
In the upper right corner of any Facebook page, click Settings. In the left column, select Your Facebook Information and then Deactivation and Deletion. Select Delete Account from the drop-down menu, then Continue to Account Deletion from the drop-down menu. Enter your password, then Continue and finally Delete Account.
How to permanently delete your Facebook account
How to Delete Facebook Account Permanently – Easy Way
How do I permanently delete my Facebook account on my computer?
In the upper right corner of any Facebook page, click Settings. In the left column, select Your Facebook Information and then Deactivation and Deletion. Select Delete Account from the drop-down menu, then Continue to Account Deletion from the drop-down menu. Enter your password, then Continue and finally Delete Account.