Go to
Administration>>Provisioning>>Screen pop up.
Click on the add button on the right hand side.
How to configure disposition : https://helpdesk.txcontact.com/kb/article/269-calldisposition-screenpopup/
Fill out all the details and add the command.

Click on Add button to create the screenpop.
Go to
Administration>>Provisioning>>Prov Settings
click on the
Setting Name.
Once user clicks on setting name it will redirect to the
Provisioning Settings page.
, Under the
Screen POPs option select the created screen pop up.
Click on
update button .