How can I cut and paste from xterm _into_ another program ? (NOTE - I am not an IDIOT)

[Joe Schmoe]

Hmmm...so instead of actually reading my post, several
folks have responded ... presumably just looking at
the words "cut" and "paste" in my post and responding
with a tutorial on how to use my mouse buttons. 
Thanks.

So I'll start all over.

I am running X on fbsd 5.3, with ratpoison as my
window manager.  I only run two apps - xterms (1 or 2
or 3 of them) and opera (my web browser).

I can cut text in my xterms by simply highlighting it,
and I can paste that text back into that xterm, or a
different xterm by clicking my right mouse button.  So
yes, I know how to cut and paste thank you very much.

I can also cut and paste in opera by selecting text
and choosing edit->copy from the menu - I can then
paste that text back into opera with edit->paste, or
shift+insert, and FURTHER, I can paste that text into
any of my xterms, with shift+insert OR with my right
mouse button.

THE PROBLEM IS, if I cut text in an xterm, I cannot
paste it in opera.  That is the only problem.

So to recap, I know how to cut and paste - thanks.  No
need for the mouse button tutorials.  All I want to
know is, why can I not properly cut and paste from
xterm TO opera, when I can already do it successfully
gtom opera TO xterm ?

Thanks.  Hopefully anyone responding will actually
read the post this time.

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