How to connect to a Database made by Oracle SQL Database?
Try to connect with 

 sqlplus SYS/PASSWORD@ORCL 


If you can connect with this from command line you can connect with Sql Developer.

You have two options


Connection Type : Basic


SID = orcl
Username = SYS
Password = password
Hostname = YOUR_MACHINENAME_OR_IP



See Image


Connection Type : TNS


Choose SID from dropdownlist. It should read your TNS File and auto complete your dropdown list.
Username = SYS
Password = password





The catch here. Oracle Connection string  for OCI expect same argument in your tnsnames.ora file. If you use basic connection you should be able to connect from everywhere without modification. But if you need to connect with other connection types, you may need to enter your IP address in your tnsnames.ora file.