Exploring Introduction to service structure

I am new to BLE and I am exploring Introduction to service. However I am stuck with Step 1 and Step 2. Is Step 1: static ble_os_t   m_our_service; (to declare a service) and step 2: our_service_init(ble_os_t*m_our_service); (the error says expected expression before ble_os_t). What is the way to define and initialise a service?