What you need to know about Easyjet mobile apps
There is an iOS app from Easyjet which will work on your iPhone, iPod, or iPad.
For Easyjet Flight Club members, you'll be able to manage your account from the app, though using their website will no doubt provide more functionality
The Android apps from Easyjet work with all Android phones and tablets from various manufacturers (Samsung, LG, Google, etc.), and Android Wear watches might also be compatible. Perhaps standard practice these days, the Android app offers the same functionality as the iOS app from Easyjet.
Also take a look at Easyjet's website by clicking here — you should be able to do what you need there.