mugman17,
Under the data tab for form properties set the form for allow edits = no and allow additions = yes. Then on the fields 'on Got Focus' event you could have a message box pop up and ask for the password. If the password is valid then:
Me.AllowEdits = True
Me.Refresh
MsgBox "Record Editing Enabled", vbExclamation, "Edit Mode"
This will allow the record to be edited. In addition, on the forms 'On Current' event you will need to disable editing by putting in this code:
Me.Allowedits = False
This way the form will not allow editing to old records but should still allow you to add additional records unless the correct password is entered. Another way you could set this up would be to have an "Allowing Editing" button on the form that asks for a password instead of each field unless you only have a few fields on your form. The button could really make this process easier from the standpoint of having to protect every field. If you need more help post back.
HTH,
Kevin