Open subform for editing

Help! MY brain has hit a black hole.
I have set the Allow Edits property of my main form to NO, created a command button to allow edits and change the back color and cmd button text. What code do I have to add and where do I add it to open up the subform for editing??
Also can I change the back color of all the controls on both forms from white to gray on form open with code? If so what would be an example of the code. Thanks for your help!
Below is the code that I have written for the command button.

Dim ctl As Control
Dim lngBackColor As Long
Me.AllowEdits = Not (Me.AllowEdits)
If Me.AllowEdits = True Then
Me!cmdEditRecord.Caption = "Lock"
lngBackColor = vbCyan
Else
Me!cmdEditRecord.Caption = "Edit Record"
lngBackColor = vbWhite
End If
For Each ctl In Me.Controls
If TypeOf ctl Is TextBox Or TypeOf ctl Is ComboBox Then
ctl.BackColor = lngBackColor
End If
End Sub