Using the drop down field - How to I make it so when someone picks the "Other - please specify below" a text field will pop up under it

This particular field I have the question for is on the Additional Information page under "School where immunizations records are held"

Add your text field to the form, the conditionally show that field when "Other" is selected in the appropriate field:

https://www.jotform.com/help/316-How-to-Show-or-Hide-Fields-Base-on-User-s-Answer