How to you add a new triple whose object is something whose URI you know?

One way os to bring it up in the tabualtor, do a copy (Control/c) and then add a 
triple and use pase (control/v) in the object field.   But this currently 
doesn't work for a web page, as that is just displayed in firefox.

There is no way to just edit the URI.  It would be nice if that were an advanced 
option on the object field autocomplete box, to swicth to inputting a URI 
instead of a label.