Sounds like your arduino does not get any signals from the encoders. We should first make sure that they are working properly before you are able to home/calibrate properly.
First make sure that your encoders are connected properly like this picture describes:
EDIT: Here is the link, there you can click on it and it is shown in a big format 
https://genesis.farmbot.io/v1.2/docs/plug-everything-in
Some people got in trouble understanding whats meant with this picture. If something is unclear, feel free to ask
Next thing - I assume that your motors were shipped with the encoders mounted. Make sure that the wire is connected (just want to make sure 
)