Adding in sizes?

Hey
I’m super new to wordpress and I’m sure the solution is easy but I can’t figure it out so far. I needed to add some attributes to my little online store and I think your plugin would work perfectly. I’m just not sure how to add in the code with the data to show the different sizes, colors, etc. How do I format the [attributes_table] to have the variations show up? I have the box showing up on my page but no data appearing in it.

?? Thanks so much