On the calls page you have the ability to both view existing, and create new calls.
At the top the "Create Call"-button allows you to specify a call-type to create and will bring you to the call-creation wizard.
Below, your call drafts will be listed if there are any. Click on any of them to resume your draft from where you left off.
The last component on the Calls-page is the list of all calls. The table displays a variety of different information about the calls, allows you to filter by different columns, and a click on "Customize View" brings you to a dialog to configure which columns are being displayed (Read more about "Customize View").
Usually, as the last column on the right hand side you will find a button labeled "View" that allows you to access the details of the call, takes you to the Call Details.