Fix Popup Link, fix title, add own Popup

I fixed the link in your popup. I could have sworn we already tried this way when in the conference room, but whatever. It works now.

I've added my own popup and changed my marker so that I have the custom marker. You should be able to use my code as a guide to use your own marker (the file is already saved in github, so in the place where I put my marker's file name, you just put yours). You might consider also copying the heading tags that I used in my popup, but of course that's not necessary.