Hi Ali!
The error that the modeler gives you tells you that the parameter of the microflow does not match the object on your page.
You can find more on that here: https://docs.mendix.com/refguide/consistency-errors-pages/
Furthermore these learning paths might be helpfull for you:
https://academy.mendix.com/link/paths/40/Mendix-Basics
https://academy.mendix.com/link/paths/82/Crash-Course
https://academy.mendix.com/link/paths/6/Master-Modeling-Microflows
Hope this helps!