In the Events Schedule demo folder you can find the Classes XML file that you can use for a quick classes set up. Images are not included in the XML file.
To import the demo XML file, in the WordPress dashboard go to Tools > Import and select to install from the list WordPress Importer. After the installation is complete, select and upload the XML file.
After this, the imported posts will appear in your Classes > All Classes tab.
You can import also the demo schedules. In the Events Schedule demo folder you can find the Schedule JSON file that you can use for a quick schedules set up.
To import the demo JSON file you should go at Classes > Schedule Builder and click on the Backup Options button, to reveal a row of buttons. Click on the Choose File button, to browse for the demo JSON file, select it and click on the Import Backup. If you wish to create a backup of your own schedules, you can use the Download Backup button, that will export your schedules in a JSON file.