what exactly is 'not right?'
drop feed dogs- use a hopping (darning/ free motion) foot.
practice, practice, practice on a small 'practice sandwich' until you get the hang of moving the fabric at the same speed you are stitching.
often it helps to use the same thread top & bobbin- make sure you have a new (correct size) needle- that corresponds with the thread being used- without knowing what it is that's not right- it's hard to tell you how to fix it.