How do I add a nameplate to my video in the desktop platform?

From the desktop platform click "Create Video" in the upper right hand corner and select Creator Studio.
Record, upload or select a clip from your Digital Library.
After a clip has been added click on the three vertical dots on the right hand side of the clip and select "Edit Clip."
You have the option to put a new title on your clip.
Below that is where you can add a "Primary Nameplate" and a "Secondary Nameplate" (i.e. your first name, last name, job title, email address, phone number, etc)
Once you've added a nameplate(s) click "Save Clip and Return to Video."
By clicking on the three vertical dots again you can select "Preview Clip" and the nameplate will appear.