So I recently signed up for a website, it's all been approved and they told me to download their software and input the details they gave me, which I did, and everything was fine - I was logged on to the site. However, I decided that I wanted to change my username which they then set up for me, but when I tried to log on the next time I was unable to. I've been trying ever since with no luck. The message I keep getting is: cannot connect to server, username must contain a-z A-Z 0-9 -_ combination. I just don't get it - so I've emailed my contact at the company and he's at a loss too. I've tried loads of times so it's very frustrating. They told me to keep trying while they look into it for me. Can anyone help?

