Help with numbers

Hi All

I was wondering how I would assign a function to a specific tab, i'm currently entering it manually.

All i want to be able to do is enter a number into the first cell(A), have the adjacent cell (B) be a constant and have them divide and produce a result at (C)

A/B=C

Any help would be great, I've tried looking for answers in google/numbers but couldn't find anything specific.

Thank you.

 

Yeah thanks dude. I was stumped because the formula editor icon was grey.

thanks!