Add a textbox for dropdown "other" option

I need a text box to open for more specific description when the drop down selection "Other" is selected. How do you do that?

You can add long/short text entry fields to the bottom of the dropdown and then show/hide it based on the responses.

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

Demo Form: https://form.jotform.com/91158790121960