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You can find a lot of useful information on how to use Superimpose Studio under the “Info” button on the top toolbar.
Here’s a great demo of Superimpose Studio on the iPhone by EatAppleNews.com

If you have just downloaded the app or have updated to the newest version, remember to reboot your device. Just like Windows and Mac OSX, rebooting is recommended after installing new software.

Many bugs are due to memory issues. You can also try uninstalling and reinstalling the app. Photography apps are very memory intensive and this should resolve it.