If you forget your Magento username or password that allows you access to the backend of Magento and the 'forgot your password' link isn't mailing you the information you need you can update the password yourself.
To reset your Magento password:
Log into your cPanel account
Navigate to and click into the phpMyAdmin section
Click on your database name for Magento from the sidebar on the left
Click on the SQL tab and type the following into the text box:
UPDATE `admin_user` SET `password` = MD5('PASSWORD') WHERE `username` = 'USERNAME';
You'll want to replace the capitalized values with the correct information:
So, if your username was 'admin' and you wanted to reset the password to '123456', you would do this:
UPDATE `admin_user` SET `password` = MD5('123456') WHERE `username` = 'admin';
If you don't know the name of the user you want to update, you can see all the users by clicking on the 'admin_user' link from the sidebar. The username column from within the Browse tab has a list of available users.