How do I get back to my site after Paypal payment?

[mySITE4u]

Hello everybody!
I try to test Paypal payment and use PP Sandbox for it. I did payment  and need to be redirected back to my site in order to process notify.php  but Paypal doesn't not redirect me back to my site.

What did I miss, how can I get redirected back?

Thanks for advance!

[mySITE4u]

Setting Up Auto Return
To set up Auto Return:

    Log in and click the Profile subtab under My Account.
    Click the Website Payment Preferences link under Selling Preferences.
    Click the On radio button to enable Auto Return.
    Enter the Return URL. Note: You must meet the Return URL requirements in order to set up Auto Return. Learn more about Return URL.

[stinga]

or setup your paypal extra info correctly