The linked topic was marked as "solved"... but is it?
It's quite weird that the world-known default shortcut "Paste without formatting" was overwritten.
When you're adding a dashboard (speed dial) icon, you can use the left and right arrows to choose different images embedded on the page you're adding.
speed-dial.png
You can also turn off sponsored content in Settings:
promos.png
What I'd like to figure out is how to add my own images where the page doesn't have any suitable images to use for the speed dial icon.