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The PayPal Sandbox is an environment within which you can prototype and test PayPal integrated form. You can test your form and make dummy payments as well. The PayPal Sandbox is an almost identical copy of the live PayPal payment system.
You can enable the Paypal sandbox by clicking on the gear icon of your paypal payment question and then clicking on the "Show Properties". Please check the screenshot below:
You will have to signup for a PayPal Sandbox account by clicking on the following URL: https://www.sandbox.paypal.com/
Then use this email address to make the PayPal payments. The following guide should help you: