I have set up forum with a "locked.txt" file ("posts") and a "members.txt" file with a list of usernames. But when I try to sign in using one of the usernames I get a login dialogue ("Authentication required") with my own (admin) name pre-enterd. If I overwrite this with one of my listed usernames and a password it will not accept any of them, but reverts every time to my own (admin) user name. I'm guessing that I have to change something on my host server but I'm at a loss as to what. An y hints gratefully received.