The "QBDBMGRN" process is a Windows-only service that allows multiple users to access a QuickBooks company file over a network. Since you are using a MacBook, which runs on a MacOS operating system, the QBDBMGRN not running on this computer. QuickBooks for Mac has its own built-in database server manager to manage company files over a network. The equivalent process in QuickBooks for Mac is called "QuickBooks DB."