How to enter Admin panel?

Hello, i have an React JS landing page, deployed with docker-machine, with domain created on Godaddy. Question is, what to do to connect Ghost blog to my cite, for example if i have examplecom, and after the connection, i can go to example.com/blog and see my posts, should i make some changes on my React app or just connect Ghost Pro? Coz when i try to login with example.com i got redirected to www.example.com/ghost and nothing happens, how i can enter admin page and setup /blog endpoint? Help pls, coz i can found any info in one place, thx