SSH into the server and then type in:
For production instance: cd /opt/odoo11/custom/addons_2/matrix-staging
For testing instance: cd /opt/odoo11new/custom/addons_2/matrix-staging
Once in the prod or testing folders, type in "git pull origin master" (without quotes) then enter in the git lab credentials which are
username: ebourne@equityandhelp.com
password: SuperHelp2018#
It will then show a list of all the changes to the files that were made.
Afterwards you need to restart the server instance for the instance that you uploaded to (odoo11/odoo11new) by typing "service odoo11 restart" for production, or "service odoo11new restart" for staging. Once you restart the instance you will have to upload the affected modules via Apps in odoo.