I don't think you can change the password. If you have forgotten then request a new one otherwise I guess you need to create a new account.
You can click on Forgot password, and then a new password will be sent. As of now this is the only way to do it ...
Yes... Changing password is not possible with clickbank. The only way is to write it safely somewhere else to get sacked from the site.
Just click account settings and the option to change your password is in the first box. Kinda a pain in the ass because the password requirments. 2 upper case letters 2 lower case letter 2 numbers 2 special characters (examples: !@#$%^&*)