There's a chance that the wires in your electrical box are a different color than what's shown in the user manual. In the US and Canada, the electrical code allows for the following wire colors to be used for line, load, neutral and ground wires. If your electrical box has these colored wires, then you can connect them to the corresponding wires of your ecobee Switch+:
Load wire to Switch wire
Line wire to Switch wire
Neutral wire to Neutral wire
Ground wire to Ground wire
If the colors in your electrical box are different from the ones listed above, you will need to consult with a certified electrician before making any changes at this location.