I've noticed since the latest messageboard update that new members names have a long series of numbers after them. If you'd like to change your username to something else it's very easy. Here's how you do it:
First, make sure you are logged into the messageboard.
At the top of the screen (it doesn't matter which forum you're viewing) click on My Profile
At the next screen (the Control Panel) click on Edit Profile
The first option on that page is your display name. Delete the current name and type in the name you want displayed on the messageboard, then click the Save button at the bottom of the screen.
You'll be taken back to the Control Panel screen. To return to the messageboard click on the Cricut Community banner at the top of the screen.