Okay so i'm pretty new to VBA and I've been trying for hours to get this calculation to work

I simply want to the net amount number when multiplied with the ceiling price (the prices are in the subform in the bottom right of that image) to show the total in the unit price column. I've tried loads of different thing but keep getting errors or nothing happening
Can someone help me to get this to work, it's really really annoying

I simply want to the net amount number when multiplied with the ceiling price (the prices are in the subform in the bottom right of that image) to show the total in the unit price column. I've tried loads of different thing but keep getting errors or nothing happening
Code:
Private Sub orderLineTotal_Click()
Forms![sbfrmOrderLine]![orderLineTotal] = Forms![sbfrmCeilingPrice]![ceilingPrice] * Forms![sbfrmOrderLine]![orderLineAmount]
End Sub
Can someone help me to get this to work, it's really really annoying