Setup a workspace as shown in https://github.com/kubernetes/community/blob/master/contributors/devel/development.md
Do steps 1 and 2 https://github.com/kubernetes/community/blob/master/contributors/devel/godep.md
make changes to the code
continue on https://github.com/kubernetes/community/blob/master/contributors/devel/godep.md
If you see an error for missing jq, download it at https://stedolan.github.io/jq/