You may access cPanel or WHM by logging into the client area, selecting 'My Account' at the top right of the screen, and then clicking on 'My Services':
Click on any available product row to be taken to the details page for that product:
On this page you will find a 'Login to cPanel' and/or a 'Login to WHM' button towards the top left of the screen:
Please note that these buttons will only work if your nameservers have been updated to our own.