How to create a URI for a remote replica server

I have created a 3-node replica cluster in a single server using localhost as bindIp. Now I need to change access to a hostname where I can access the replica cluster from a uri.

How can I change the bindIp to access from any Ip under a given hostname?
How can I obtain a URI string for this cluster to access through MongoClient?

You either bind to all or to an accessible IP address of the machines.

See https://docs.mongodb.com/manual/reference/connection-string/ for information on how you create your URI based on the hosts of your cluster.