Customize.md

 ## Greenlight customization
 
-Customized version here in git in branch `fairteaching`.
+Customized version here in git in branch `fairteaching`. 
 
-after doing changes do in `~/greenlight` or in `.env`
+after doing changes do in `~/greenlight` or in `.env` build to registry (`docker login registry.osalliance.com`).
 
 ```
-./scripts/image_build.sh bigbluebutton/greenlight release-v2
+docker build -t registry.osalliance.com/osalliance/fairteaching:0.4 .
+docker push registry.osalliance.com/osalliance/fairteaching:0.4
 docker-compose down
 docker-compose up -d
 ```