Right Click>Insert Logo
Go to the PDF http://blogs.adobe.com/adobecustomersuccess/2011/05/14/help-support-pages-for-creative-sui te-applications/ link and download the PDF for your version
There is a section inside the PDF for how to add graphics to a title (most likely the same information is also in the "press F1" help file
You can also add a logo, or other graphic, independently of the Title, and have it appear over the Title itself. I find this method useful, where I wish to animate the logo/graphic, separately from the Title.
Just Import the Still Image, and drag it to a Video Track above the Title and any Video. It can be animated to suit your needs.
On a side-note, do you have the logo in a format, besides the compressed JPEG? If so, I would skip JPEG, and use the native format, or if Vector, Rasterize that in Photoshop, and use PSD.