I just realised my email address on the profile page is wrong.
When I change it the password isnt recognised. Do I have to sign up again or just leave it.
I want to keep my user name
I think that your e-mail is part of your main registration details mate. If that is the case, you need to pm or e-mail one of the administrators, giving them your details as entered in the initial reg’ and the detail you want to change. They are able to change some stuff in there, which us lesser mortals can’t 
.
It might be that it isn’t possible to change your main details but you could rereg’ as WheelNut instead .
Changing the email address should be straight forward enough. When I first registered I did it from work, so put the work email as my contact address, got the email from Rikki confirming me as a new member, then changed the email address to one of my home ones.
Password - when you connect to the site do you log in automatically 
If you do then try editing your profile to not log in automatically, go back to your homepage, then back to Trucknet, log (hopefully with new password) and set your profile to login automatically again.
If that doesn’t work then you may have to clear the cookies from your temp internet files. Go in to the Internet Explorer properties and under the general tab there is a button labeled delete cookies. Then repeat the above with your profile. Doing this may mean other sites you visit that need a password may ask you for that password.