you can't get there using the built-in file manager. (crappy, i know.)

get emelfm2. it's very useful, especially once you memorize the functions of the many button icons. (you'll see what i mean when you run it.)

EDIT: ok, i guess i wasn't quick enough on that one. and that's a good tip about changing to root. you will have to do that to modify /usr, but not /home