Click and drag on text to highlight, CTRL C to copy. Switch to the post window, CTRL V to paste.
As for default bow deck gun there's a ready made mod for that;
http://www.subsim.com/radioroom/down...o=file&id=4364
No guarantee how compatible it is with other mods, but it's easy enough to hack it yourself;
http://www.subsim.com/radioroom/show...8&postcount=22