Sorry for the really bad look on the post, first time doing this
This is REALLY simple, doesn't take longer that 5 mins
You do need to be jailbroken for this
All you need from Cydia is:
App Admin
Appsync Unified
Step 1: Download those two tweaks.
For App Admin add this repo: http://beta.unlimapps.com
For Appsynce Unified add this repo: http://Cydia.iphonecake.com
Step 2: Go to the AppStore and download Deezer version 6.0.0.
IMPORTANT: If you haven't downloaded Deezer at all, you need to for App Admin to work, So go to Deezer on the AppStore, tap get, download, delete Deezer, go back to the AppStore, tap the Download button again and this time it should say downgrade, tap on downgrade and download version 6.0.0.
Step 3: Open Deezer and Sign in or Make an Account
Step 4 ENJOY