If you look to the right hand side panel, your name is listed in the first tab. It will be something like "CMDR Backer #234234" initially. If you want to change it, you need to follow this process:
1. Login at:
https://support.orerve.net/
2. Navigate to the ‘COMMANDER PROFILE’ tab
3. Enter your desired new commander name in the ‘Request a New Name’ field and press the ‘Request Name Change’ button.
4. If this is approved it will update the commander name at the top of the page.
5. If it is automatically denied a red message will appear above the field, stating the reason for the rejection.
6. If it is manually denied the player will receive an email telling them that their name has been rejected, once the batch update is complete.
P.S.
Please search the forums before asking, this was asked and answered multiple times.