Updating the database within the app.

Hello, Today I started creating my first app using the appery.io database services. I used the youtube lessons 4 and 7 as my main learning material. I basically want to make exactly what lesson 7 was, but i would love people using the app to have the ability to update the database for each selectedProduct. I tried a couple of ways but I couldnt figure out how it is done. I realise I have to use the Update service function and textinputs with buttons. I was wondering if anyone could help me figure this out.
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