Another reddit tutorial, this time from /r/photoshopbattles. I start off showing how to remove the text from the sign. Skip to 7:14 to see the actual displacement map action! Please feel free to leave any questions in the comments or in reply to my comment in the reddit thread.
The only thing I didn't mention in the video is that you could probably play with the opacity and transfer modes to make the text look more like it actually exists on the page.
Sorry about the sound quality and loud keyboard clacks, I'm recording with my built in laptop mic today. It turned out a bit blurry, but I suppose that's inevitable downsampling from a 2k display.