Go to your profile. There, next to the “edit profile” link, is a “change avatar” link. Click it and you will be able to change your profile picture.
There are two ways:
1) If you remember your password you can change it in the “edit account settings” page which can be found by hovering over “My profile” in the top right part of the header.
2) If you do not remember your password click on this link: forgot your password?
This will ask you for your email to send you a link to change your password.
On the right top of the header you can hover over “My profile” which opens a menu.
Click on the “Edit account settings” link.
Click on the “Delete Account” green link just under the logo.
Enable the checkbox which says “I understand the consequences” and then click the green “Delete account” button. That’s it!
To register again click the “register” link in the top right corner of the header and follow the steps.
You do this by clicking the register link at the top right part of the header. This will redirect you to the registration page. There you fill in your information and then you push the “Complete Sign Up” button. After that you will receive an email with an activation link (if not check your spam folder!). Click on the activation link and then you will be redirected back to the website where you can login with your username and password that you created.