To change the name of the Facebook tab where your form is published, go to the Admin Panel
of your Facebook page and hit the Settings
button on the top right corner of the page. Go to Edit Page
and scroll to the tab of your form. Afterwards, click on the Edit settings
to insert the custom tab name.
In the lightbox, type the new name for your tab in the Custom tab name box. Here you can also change the image tab.
Press Save and Ok, to exit the lightbox. You will see the changes to your tab on the Facebook page.