You can either watch this video or follow the 6 steps below
(Having trouble seeing the video clearly? Switch it to 720p ^ and select Fullscreen.)

Logon to www.shipwithpriority.com

Click Account Reports at the top
           

Click Save Login Shortcut
           

If prompted to Open or Save, Click Save
           

In the Save File window, select your Desktop and click Save
           

Use the Shortcut on your desktop to logon in one simple step.