1)

Click the floating plus icon in the lower right of a folder

2)

Enter a name for this tooltip

Add a URL rule where you want to place the tooltip 

3)

Select "Validation & Tooltip" from the options

4)

Capture an element, add a guidance message and customize the icon if you like

Capture an element, add a guidance message and customize the icon if you like

5)

Select tooltip icon position from here

Select a validation type for the captured element

6)

We will select "Mandatory field" as the option

7)

Enter a validation message

Customize the position and action of tooltip

8)

Click "Save"

9)

Publish this tooltip and it's respective parent folders

10)

Hover over the tooltip 

11)

Here is the tooltip in action

12)

Select "Tooltip Guide"