@JohnK.N. Thanks for replying, what do you mean, when you said it will tell me what it prefers?? based on my understanding this is where i setup the connection manually and it can be anything I want as long as it exists.
here's the content of the file
# tnsnames.ora Network Configuration File: C:\WINDOWS.X64_193000_db_home\NETWORK\ADMIN\tnsnames.ora
# Generated by Oracle configuration tools.
ORCLPDB =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
)