By default, your Flipbooks will open on the first page. However, you can create a link that opens your Flipbook on a specific page.
Simply replace index.html from the end of your Flipbook’s URL with ?page=2 where 2 is the page number within your Flipbook that you would like it open on. Please see below for an example of this.
Flipbook URL (HTML5)
Specific Page URL (HTML5)