I really cant figure out how to add a header logo. I've read "How To Add a Header Logo" but im not able to find the place where i have to put my logo image url.
I would really appreciate if someone is able to help me.
Thank you in advance.

Thanks for your response. I've read and re-read the notes above, and i don't see how to activate the tag and blog tabs. They're there, but when I click on them, they don't sort my posts by tags or blog archive. I read above how I can re-name them, but I don't see how I can make them active. My apologies if I'm missing something.

read the instructions given above.