Creating Highlights and/or Reviews in the iOS app is a snap. (Every user can create a highlight, but only coaches or admins can create Reviews.)
Open the game you're wanting to take clips from, and click on the 'Filter' tab in the upper right corner of the screen to search for the footage you want to pull out for your Highlight or Review:
In the filters, pull out the clips you want by tapping on the search parameters. Below, the search is for CSP's aces in sets 2 and 3 (you can see the clip tally at the top center of the page: 5 clips). You can add lead or lag time to the clips (or clear the filters) in the upper right corner of the screen.
Once your search has been set, go back to the game to watch the filtered clips (by clicking on the game title at the top left of the screen):
Notice the "Star" icon now present, both in the upper right hand corner and along the right side of the screen:
The two "Stars" have different functions: if you click on the "Star" at the top of the screen, ALL of the clips resulting from your filter search will be added to either a new Highlight or Review, or the Highlight/Review that you select from the list of available options.
If you click on the "Star" along the right side of the screen, the SINGLE clip you are presently watching will be added to a new (or to the selected) Highlight or Review:
If you choose to add the clip(s) to a new Highlight or Review, you'll be able to name the Highlight or Review, and (in the case of a Review) choose the recipients of the Review: