Writing a properly funcioning unbound form, is waaaaaay more difficult
than writing a normal bound form. I'd advise you not to attempt it,
unless you are thoroughly familiar with the Access Forms event model,
and with VBA and DAO programming.
You'd be much better off, IMHO, to find out /why/ they can't update
their data through a normal bound form. Otherwise, it's a bit like: "My
car engine is smoking, it must be the roof-rack, how can I replace the
roof-rack with a stainless-steel scaffold?" (IOW, you are guessing
how to fix the problem, without knowing what is causing it.)
HTH,
TC (MVP Access)
http://tc2.atspace.com