Or you copy and paste and put the coding in manually.
Or you can quote a reply, copy that, quote the other reply and paste the first one into it, that way you don't lose the link to the reply or the smilies.
It's a matter of putting the pastes into the right place.
It looks like (for this post)
quote=Jan, quote=knittinggymnast Hi all......... end quote When you....... end quote