Log in Sage which require username

Hello Everyone ! Howto log in to sage 50 quantum accounting software data access remotely? I already install sage 50 in my computer ang log in the account of my client but sage is requesting for username and password which my client did not know because it the first she encounter. Do my client need to send me an invite to access the their sage account? My location is PH and my client is in US. My I know whats wrong with our log in process? Thank you