Oracle ORA-12154: TNS: Could not resolve service name Error?

I am a SQL Server user .

I am on a project that is using oracle (which I rarely use) I need to create an ODBC connection so I can access the some data via MS Access I have a application on my machine called oraHome90. It seems to allow a configuration of something called a listener in a “net configuration utility”, I think that a “Local Net Service Name Configuration” needs to also be done. The IT support gave me this information to set up the ODBC connection . I have tried every combination that I can think of. I can get past a test that successfully passes a test to “login“ to the oracle server database. When I try to create the ODBC connection I get the following error: ORA-12154: TNS: Could not resolve service name.

Assuming that I want to start from scratch and the following information is supposed to allow for me to connect to the database….. Any suggestions or comment ? Note: ultimately the project will have a website .ASP page query the data, but I have to first prove that I can see the data using the ODBC connection via MS Access

Service name: SERVICENAME
HOST = HOST.XYZi.com
User Id: MYUSERID
Password: MYPASSWORD
~~~~~~~~~~~~~~~~~~~~~~~~~~~~

'Oracle Connection
Dim ocst
Dim oconn

ocst = "Provider=OraOLEDB.Oracle;" & _ 
        "Data Source=DATASOURCE;" & _ 
        "User ID=CHIJXL;" & _ 
        "Password=password;" 

set oconn = CreateObject("ADODB.Connection")