The share tab is one of the most important as it contains the embed code that you will share with your clients. You can copy the instructions and send to your client. Their web developer should be able to take the code and embed on their site. They can customize the style in part 1 to best fit their page.
The one thing you need to make sure you do is to find out from your client where they will be embedding the tour and whitelisting the domain in the theme. Below is a link to the themes tutorial where you can find a section on whitelisting domains.
Also on the Share tab is a tour url that you can share with anyone via social or put in an email signature. This is the same link that is on the share button when viewing the tour.