How do I use this Google append row?

Hi guys I am trying to figure out this append row

I want my data to use a new row instead of overwriting one

what must go here?

or is there another way to add data using a append method or other
I just want to to now overwrite row but add new ones, for google sheets I have seen loads of excel examples but none for google sheets

can someone just show a example on what needs to go in the row section

Do I use append row instead of write range or do I use them together