With the new text editor it's now possible to insert an image on the start page.

This feature is actually unintentionally, but nevertheless ... :-)

If you click on the Media menu and then the Image section

Then the Edit (Pencil icon)

When the dialog opens up. Right click the Image an choose Copy image address

Now open your Presentation and go to the Message for Users field and choose the Image function

Paste the link you have just copied into the box that says URL.
After that you can change the dimensions of the image in the Width and Height boxes

Click OK and you have a inserted an image