(I'm a beginner in using Arduino and MIT App Inventor)

We have this project (an app-controlled aquaponics system) where our group decided to use an app to control the arduino sensors and then show the results in the app. The problem is most tutorials focus only on Bluetooth, how can I do this using WiFi and Temboo? And where can I get the .aix files for pH sensor, water level sensor, and soil moisture sensor?

Below are pictures of the progress I made: Screen sensors/extensions blocks