What version of Premiere Elements, and what computer operating system? Assuming Premiere Elements 11 through 14 Windows for now.
The general concept...
(a) Logo on a transparent background on Video Track 2
and directly below that on Video Track 1
(b). Your clip
You can create the logo in the Premiere Elements Titler or create it in Photoshop Elements Editor with save as png or psd to maintain the transparency in the creation. Then import the Photoshop Elements created png or psd into the Premiere Elements project using Premiere Elements Expert workspace Add Media/Files and Folders/Project Assets from where you drag the png or psd to the Timeline Video Track 2.
Please consider, and supply more details.