Help API integration

I set up an API ( AI-based text in, text out) and initialized the call (GET).
I am trying to build a simple Q&A app with that. What I did create an input (for question) + Text (for answer), but it is not working.
I watched a few videos and read some materials but could not solve the issue.
I have not set up the workflow, not sure if needed for my case.
Am I doing something wrong? Please help.

Can you make some screenshots of your app?