RE: mini buffer output to ring

[Drew Adams]

    who can I kill/copy the mini-buffer output to the kill ring.
    I get a message that I need to paste to the newsgroup and if I
    highlight the mini-buffer, the message disappears.

(Most) such messages are actually printed in the echo area, not the
minibuffer (which shares the same physical part of the screen). The
minibuffer is for input; the echo area is for output.

(Most) such messages are also logged to buffer *Messages*. Simply visit that
buffer (C-x b *Messages*) and copy the message you want, then paste where
you want.