Trying to set up somone to use an email account from my domain.

The pop mail works perfectly fine however in trying to give the person acess to their account via webmail I find thatI have to log in with my administrators account before I can log in to webmail as them.

So far all the information ive managed to cull from the forums suggests that its possible however  all the suggested solutions to try to acess webmail with out using the admin logon havent worked.

is this possible at all ??
And if so How ??  

Thank you very much that worked perfectly.