I need to make a report block

Help with Snap! Snap! Editor
1

I need to create a reporter block to find the position of the first occurrence of an Item in a list
I haven't tried every way but I've tried a few things

Hhtps://youtu.be/axzlZj2uVo

2

It's a primitive! FIND FIRST.

3

The image block does exactly that.

4

5

Thank you

6

Ah right, sorry.