To manage your agent scripts click your name, settings then agent scripts.

On this page, you can create, edit or delete scripts as needed.

To create a new script click on +Add New Script then enter the name of your script and the content. Click on apply once you are done. 

Your script is now ready, to use it, edit the campaign you wish to assign it to then select the script from the dropdown. Save the changes and it will now be visible on the call pop-up when your agents call the campaign.