I assume that you are referring to the password which is created for the WebSEAL instance itself (i.e. not an end-user password)? If so, there is no easy way to change the password. You could change the password directly in the user registry, but would also then need to update the password in the WebSEAL configuration file so that it matches the expected password. This would be a manual process.
I hope that this helps.
Scott A. Exton Senior Software Engineer Chief Programmer - IBM Security Verify Access IBM Master Inventor