This video offers advice to young people who are using Ask.fm, or their parents/carers. It goes through some of the settings you may wish to choose, and how to block people and report offensive comments. Please remember that following this guidance does not mean Ask.fm becomes safe to use.
This short video shows you how you can use Guided Access on an iPad to lock an app open. This prevents the app from being closed until a passcode is entered. In this video the iPad is running iOS7, and the app used for the demonstration is Too Noisy: http://www.toonoisyapp.com