Figured it out. I was used to editing imageset. I was using the black theme so there were two folders and if you use black you have to edit in the win10_dark folder. You name your logo site_logo.gif and place it in theme/images. Then you edit in theme/common.css the line that reads,
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Change the dimensions to your logo's dimensions.
Then clear your cache and browser cache as usual. If you use CloudFlare, you need to clear that cache as well.