Unanswered Warped/Leaning Print??

Hi!

New to 3D printing here! I purchased what I believe is a Robo3D Kickstarter on my local classifieds, but sadly have not yet had a fully successful print. After finally getting the filament to stick, the two prints I have so far managed to pull both lean towards the back of the printer (Y axis) in their early layers.

Would anyone know what is required to resolve this issue? Is it simply a matter of tightening the Y axis belt? Thanks.