How to swap text on click?

I’m doing flashcards. What I want to happen is that I click the text, and then it changes to the answer, which is a different text.

So on click:
Text changes to xyz

Use data binding to set the displayed value to the answer in the On Click event.

How do I use data binding?

Start with the documentation:
https://backendless.com/docs/uibuilder/ui_data_binding.html

Also, I recommend going through the UI Builder Missions: