Hi. Have you clicked on the lil' triangle by "thread tools" above the thread, and clicked "show printable version"? Once you do that, you click "Print" on the toolbar in your browser (it may be hidden if you don't see it?) You could also click "Ctrl P" and that should pop up the printer box.
I sometimes only want to print a portion of a bookmark, so I copy/paste only that portion into a word processing program, I use MS Word, but if you don't have that, you probably have Wordpad or you could always use google docs.
Post again if you need more help, and I'll get you there!