Make sure its aligned for center shot - side to side.
nock an arrow and look down the string, visually aligning both cams/wheels, and notice which direction your arrow is pointing. Is it centered on the bow or right/left?

Similarly you can align its up and down.
Prop the bow up so that the string is vertical - use a level and a vise or jig.
Nock an arrow and adjust the biscuit until the arrow is horizontal with the ground, again use a level.

Then proceed to resighting it in.