For a simple embed, just hover over your published project to make these buttons appear:
Click on the 3rd button, and a popup like this will appear:
Just copy and paste the code in the bottom to your website to embed your tour.
We also have a Player SDK, if you want to get fancy with your embed. With the SDK, you can do things like add a div with videos inside your tour, or make it auto-play as soon as the page loads.