Initialize the form's AllowEdits, AllowDeletions and AllowAdditions
properties to False.

In the button's Click event, change those properties back.

You might consider using a toggle button, rather than a simple command
button. To allow edits when the button is depressed, and not when it's
raised, try something like:

Private Sub MyToggleButton_Click()

 Me.AllowAdditions = Me.MyToggleButton
 Me.AllowDeletions = Me.MyToggleButton
 Me.AllowEdits = Me.MyToggleButton

End Sub

In the form's Load event, use:

Private Sub Form_Load()

 Me.MyToggleButton = False
 Me.AllowAdditions = False
 Me.AllowDeletions = False
 Me.AllowEdits = False

End Sub