When you arrange a live training call you will receive an invitation via email. That email includes your PIN. Login to www.ZipDX.com using your email address and PIN.
The very first time that you login you will be prompted to add some contact information to complete your profile. With your profile completed you will be presented with a Home screen that includes areas for In Progress Conferences and Pending Conferences.
If the call you are scheduled to join has already started you will see it listed under In Progress Conferences. Clicking on the the Web Phone link will launch Zipline 3.0 and place you into the call.
If the call is scheduled to start soon, but has not yet started, it will be shown in the list of Pending Conferences along with a Web Phone link.
In this case, clicking on the the Web Phone link will cause the call to be started, launching Zipline 3.0 and making you the first participant in the call.