Sounds like you are talking about login here in CodeProject website.
It's odd that you are able to post with login but no password. My guess would be you have saved password and thus logged in by default. Once the cache lifetime is over, you will be asked to re-login.
For now, either you can use signout option at the top (if you are really logged in, it should show up at right top corner) and then try to retrieve your password using 'Forgot password' option.
If you still have issues, bring this to
Bugs and Suggestions[
^], and someone from site admin will help you with it.