Gravity Press has a feature that enables you to auto-log in new members who have just signed up for your Gravity Forms.
To enable this feature, simply go to your Gravity Forms → Settings → Gravity Press. Create a new Gravity Press feed or edit an existing one. On the configuration settings, scroll down to Advanced Options and check the box for Auto-login and hit on update settings to save it.

I dont have this option available ?
Hey there, this feature was only apart of Gravity Press 2.X and not yet 3.X for a while, but we’ve recently added it to 3.X. You can simply login to your account at ristrettoapps.com and download the latest version. If you have any trouble, let us know!