Sign In problem

Registered yesterday and again today. Yesterday’s Username didn’t work today. Spaces not allowed even though there were none that I could see. Writing this in case mods wondering why 2 sign ups in 2 days.

Now a question. Not sure what “write speed” means for my old Canon Rebel XT. Looking for another 2 gb FC card and I’m finding some called Dual, others Extreme. There’s an Extreme working fine in the camera now. Will a Dual work as well?