Please help: Change posting font in theme?

Hello all,
I have installed the latest version of WordPress and currently modifying its apperance and functionality to my liking.

I have installed one of the “approved” themes from their library but can’t seem to figure out how to change the font and size of the actual postings made on the weblog.

I’ve gone into theme editor for the style chosen and have been through all templates but can’t seem to successfully change the font.

I’m wondering of someone can kindly tell me how to make this change on an installed theme? The current theme of choice is titled “Sodelicious Black”. Have done a search for “font” under everything in theme editor and none of the changes seem to work.

Any help is greatly appreciated!

Thank you,
–mike