Once you are adding a Gravity element, a ring menu appears. The ring menu is divided in 4 different steps. 1st step allows you to configure the position of the callout or walkthrough element.
The 2nd step allows you to configure the content of the callout. The 3rd step is more for advanced users where you can modify the styling or behaviour of the callout with help of JQuery code. With the 4th step you can rather cancel or save the edits you have made to the callout.