I'm trying to change repository name of the image:

REPOSITORY          TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
server              latest              d583c3ac45fd        26 minutes ago      685.5 MB

Hence I want to change the name server to something like myname/server:

REPOSITORY          TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
myname/server       latest              d583c3ac45fd        26 minutes ago      685.5 MB

How can I do this?