To link the welcome page to the Muse website I had to turn the Deleytha logo on the screen into a button/link.
I did this by clicking on the actions button at the bottom of this image.
After clicking, I selected click from the top of menu.
I added in the text that I found on the link at the beginning. I replaced where it said index.html in the example to site.html so it would link to the Muse webpage.