Open Google Maps, and open your tour. If you have the link I provided you, skip to step ....
Click on the three dots at the top of the tour to access menu.
Select Share and Embed image.
You can choose to add either the link or embed the tour. Ask your webmaster if you are unsure.
To Embed the tour, Select Embed image option.
Now copy the embed script so you can paste it into your iFrame/embed gadget.
Your content goes here...