On a computer: Simply login, click the blue "Play Games" button next to their name, then click on the game icon and away they go!
On a tablet:Download the app first. Then login using the same details, click on their name and chose their game.
Watch the steps in this video:
The first time children login they will be given the option to start from the beginning or to take the assessment (which will jump them to the relevant level according to their results), so make that decision for them before they start playing. If they are brand new to phonics just start them from the beginning, however if they've got some knowledge, take the assessment - we don't want them getting bored because it's "too easy".