when u install openssh it installs itself with openssh client and server so when it's installing it asks u for a password for u to have access to your files in your device,after u write the password the instalation finish and u're ready to go,i recomend u WINscp if u're running windows,if u do,in the host name u should write the ip of the device,in user name type: root and in the password field type the password that u wrote when u were installing openssh and u'll see a connecting window,if something prompt just click on yes and continue,u'll be able to see all your files there,add,remove,modify them,whatever u want,good luck.If u're using x terminal as u said just install becomerrot and type sudo gainroot and u should be able to become root without any problem.. try again and good luck again