To mark a Bible verse as a favorite, tap, double-click, or highlight a passage to select it. A toolbar will appear; tap or click on the 
icon to "favorite" your selection. The process looks like this:
If you're logged into a BibleGateway.com account, your favorite verses will be remembered and stored with your account. They'll be available to you on any device so long as you're logged into your BibleGateway.com account. Passages you've marked as favorites are tagged with a 
icon, like this:
Click or tap on the icon to un-favorite the passage.