Hi Julie,
It depends on what your conditions are, but the general idea is that you will use an IF statement. There's a
video tutorial here that talks about setting up conditions. There will be a Part 2 soon that expands on it to handle multiple conditions (IF, ELSE IF, ELSE), and using the AND block. But here's a video that shows you how to use the AND block to create a condition that looks at multiple things -
https://www.screencast.com/t/yjnkjh5J