How to deploy existing plugin after updating to crm online?

I am using dynamic crm 365 online version 9.0 and I have a plugin (as workflow) made there. I need to change some code on this existing plugin and redeploy it to my online crm. I have installed crm sdk with plugin registration tool and packager deployer. But I don't know how to deploy this updated plugin to online crm.

Any help will be appreciated.