Add Custom Comment Fields to Posts

I'm using Atahualpa 3.4 and I'd like to add custom fields that I can optionally display at bottom of each post and also in a sidebar.

I'd like to add something like this for each post ->

Today's Wine: Kendall Jackson Meritage, 2006.

Tasting Notes: Black Cherry, coffee, light tannins, smooth finish.

I gather this is easily done, but the instructions in Wordpress help are about as clear as mud. This is pretty basic stuff, I know.

I'm not a code head. If possible, I just want simple instructions on how to use the Wordpress GUI/Atahualpa options to do it. There's probably a plug-in that makes this easy. I'm just not seeing it.