Database access requires an authenticated connection

HI
I have installed community edition of neo4j , new to this tool
When I try to launch , Bolt asks for authentication credentials

What should be the password for bolt://127.0.0.1:7687 , user - neo4j ?

http://127.0.0.1:7474/browser/

Error -
Database access not available. Please use :server connect to establish connection. There's a graph waiting for you.

Not sure what did I miss