Add a text box if check box says "Yes"

Hello:

I can't figure out how to add a text box to a "If" scenario.

IF a checkbox is marked "yes", then I would like a text box to appear that will say "please explain"....I have attached an example.

I appreciate any help I can get with this.

It seems you already deleted the form.

Actually, you can use the SHOW/HIDE field conditions to achieve that. You need to use the Radio field's value as the criteria.

Here's an example:

Here's how it works:

GUIDE: How-to-Show-or-Hide-Fields-Base-on-User-s-Answer