Report a Post button not showing up on PC when Level 2?

If you are trying to report the original post, you will find the report button after clicking on the arrow next to the "follow" button. And, you just went over 150 points - you need to give it a couple of days to "catch up".

Welcome, Jake378, to Apple Support Communities!

Wait a bit, as babowa recommended, for the system to “catch up”.

I remember it took a bit of time (possibly logging out and back in) before the little “arrow” (the square button with the “disclosure”-like “V”) showed up for me.

Give it a couple of days; the system is not instantaneous.