OK, one more time.
I went to my Cpanel, clicked on Bulletin Board, filled in the blank of where I wanted the files, and clicked "Install." That part is done. OK?
And yes, I understand that the program "will (by default) end up at www.yoursitenamehere.com/forum."
Therein lies the problem. Since I have not propagated my site to TCH (it's still on what will soon be my 'old' server), I CANNOT type in www.mysitename.com/forum and retrieve the phpBB admin page.
Since I have not yet switched DNS, the only way I can access my site through TCH is by typing in http://IP#/~username.
I tried typing http://IP#/~username/forum ... but I got an "Action Canceled" page.
Maybe I should send a help ticket ... but I hoped someone here could help.
Nan