I've recently added a Yealink W60P phone to system, does anyone know how to make that the phone that rings when our main switchboard number is called? Thanks

You have to assign the deskphone to an extension, then set the company call handling to route the calls to that extension. Follow the step by step KB links below:

First step: Assigning an unassigned phone to a user extension | RingCentral MVP

Second step: Setting up Company Call Handling and Operator extension | RingCentral MVP

• This is where you can setup the company call handling to route calls to the extension.