What are the installation steps for mounting the wallplate?

To install the wallplate: remove it from the thermostat, align the 4 tabs on the wallplate with slots on the back of the thermostat, then push gently until it snaps into place. Make sure to plug any excess wire back into the wall opening and seal with non-flammable insulation. (Page 1)

From the official Honeywell Focuspro 5000 Series manual, page 1

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