Having spoken to a few people who have had trouble logging in to MyMaths I have made a video below which shows how it can be accessed on apple devices.
The main issues seem to be the ‘Flash Player’ not working – something that Apple don’t and won’t support. MyMaths are currently in the process of changing their site so that it doesn’t rely on this, but for the moment the suggestions below should work.
The app in the video is ‘Puffin Academy’