Hi MJ -
I see you've been online several times, and have posted in other topics. Are you still having trouble staying logged in? (If so, you might want to doublecheck the "cookies" settings for your web browser.)
Assuming you're logged in, you should see a Profile button in the row, above. You can change quite a few things there, including your signature block and even your displayed username. (Your login would remain the same, but you can change the name that others see with your messages, etc.)
- Rob