amazon web services - Connecting to AWS EC2 Win8 Instance from Ubuntu with Remmina -

i'm real beginner in subject. job wants me connect our server on aws - have created win8 server there.

i have dns, username , password - thats all. understand easy if have win machine (like of workers here) i'm running ubuntu 12.04.

how on earth connect instance? dns have is:
ec2-<server>.eu-west-1.compute.amazonaws.com

do need remmina or can terminal? i'd connect server, , see gui version of server's desktop. if linux server it'd enough me connect console, windows figure need gui...

when try putting dns,username,password in remmina message:

unable connect rdp server  <server>.eu-west-1.compute.amazonaws.com 

do need know else server? need .pem key? - i've read posts , written check/delete in ~/.freerdp/certs file - file doesn't exist on computer, when ls in ~/.freerdp/ directory -> empty.

please don't know how connet remote server, , sadly couldn't find info on connection ubuntu win8 on aws.

bonus help: how install node.js on server :)**

edit

now when connect message:

certificate details:  subject: cn = win-kuff.... issuer: cn = win-kuff....  fingerprint: e4:0f:.......  accept certificate? ok/cancel 

i press ok , same message of unable connect rdp server..

i connected windows server in aws through remmina on ubuntu. configuration below,

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• server : public ip
• username : administrator
• password : ******
• domain : public dns

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i think trick server , domain. insert public ip , public dns can obtained aws instances page.

cheers!