How can use

My printer is connected to the internet at home. How can I control my printer when I leave the house?

I left the house and turned off wifi. I opened my internet, what should I do later?

Do you have an android application ?

You use same web app as locally. Solution depends on your internet connection and wishes. See
https://www.repetier-server.com/knowledgebase/access-server-from-internet/<br/>for possible options.