When I had downloaded the assignment I had used a user ID and pasword ehich I filled while I had paid for the exam through credit card, Now some how I forgot the login and password or perhaps one of them.
What would be best way to upload the assignment asap
If you remember your login, you can use the lost password link on the front page. (The login ID should be, as it says, your Prometric test ID.) Other than that, you might try contacting SunCert@prometric.com and asking them for some assistance.
(You'll need, likely, to ask them anyway for permission to upload.)
Theodore Jonathan Casser
SCJP/SCSNI/SCBCD/SCWCD/SCDJWS/SCMAD/SCEA/MCTS/MCPD... and so many more letters than you can shake a stick at!