Okta Multitenant

Hi, i am new to okta. I have created multitenant app in dotnetcore and it has build on tenant per database architecture. User and roles all implementation in our database. We want to implement okta multitenancy for authentication and single sign on purpose. How i can configure this. So i need to try it on trail account before we implement on application.
I did’nt find tge steps or help
I am new to okta so i need help step by step configuration. So i can implement this on my. Application