[Turtle91]

Typically that is a function of the app/device, not of the ePub.

However, you can assign a (semantics) tag to the file designating it as the location to open. Devices/apps that look for, and honor, the tag would open up on that page…. But…. there could just as easily be another feature in play that overrides…such as “open to last location”.

Using Sigil:
To set the samantics tag(s), right-click on the xhtml file in the book browser window and select “semantics”… then select which one you wish to apply. For ePub2 you would select "text" to designate the preferred starting page. Then click OK.

If you don’t set the semantic then it is completely at the discretion of the app/device….. most “should” start on the first page in the book order.

If that doesn’t work… then just check your opf file and make sure the files are listed in order in the spine section…. With the cover first. (Edit: Sigil automatically sorts the spine based on the order of the files in your book browser window)