How do I insert logo with site header/text BESIDE it?

Hello.

I have just learned (last week!) how to create a website for a conference I’m hosting for my organization. I figured out how to upload our logo, but I want to insert large site text BESIDE it, advertising the theme & date of the conference. As it stands now, the lovely logo sits on the left with a heap of white blank space to the right.

I know I can insert header text ABOVE, but how do I do it within the same section?

Keep in mind I’m a fresh newbie. I’ve watched some videos on how to go into the editor (using Firebug) and copy and paste and change text color, so I’m wondering if it’s a similar process?