Problem in form builder connecting to db

Im very new to oracle technology, I have just installed oracle appdeveloper 9i and im trying to use form builder. When I try to log into my database which is also under a 9i personal database, it gives me the error "ORA-12154 TNS:could not resolve service name". I tryed to search for something on oracles site and also the forums but didnt find anything. I had problems installing developer suite but was solved in another form. I had to install it under oracle homes in c:\oracle. my database is installed also under oracle homes c:\oracle\ora92. I checked and made sure that all the services listed under services on windows xp service manager were running, and I still got the error. Please help me, I need this to work for class.
Thanks in advance

I tried to change the MW (which is the name of my database, to ora92 but then i couldnt connect to sql+, I did change the host to local host though.
this is what my file currently reads:
# TNSNAMES.ORA Network Configuration File: C:\oracle\ora92\network\admin\tnsnames.ora
# Generated by Oracle configuration tools.
MW =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
(CONNECT_DATA =
(SERVER = )
(SERVICE_NAME = ORA92)
INST1_HTTP =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
(CONNECT_DATA =
(SERVER = SHARED)
(SERVICE_NAME = MODOSE)
(PRESENTATION = http://HRService)
EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
(CONNECT_DATA =
(SID = PLSExtProc)
(PRESENTATION = RO)

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I doublechecked my configuration.
In the dialog Edit --> Preferences --> Runtime the Application Server URL is set to "127.0.0.1:8889/forms/frmservlet".
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Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:32769 0.0.0.0:* LISTEN 2779/rpc.statd
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tcp 1 0 80.133.127.83:33484 209.132.177.100:443 CLOSE_WAIT 4060/python
tcp 1 0 80.133.127.83:33494 209.132.177.100:443 CLOSE_WAIT 4060/python
tcp 1 0 80.133.127.83:33520 209.132.177.100:443 CLOSE_WAIT 4060/python
tcp 0 0 80.133.127.83:33529 209.132.177.100:443 ESTABLISHED 4060/python
tcp 0 0 80.133.127.83:33528 209.132.177.100:443 ESTABLISHED 4060/python
tcp 1 0 80.133.127.83:33460 209.132.177.100:443 CLOSE_WAIT 4060/python
tcp 1 0 80.133.127.83:33470 209.132.177.100:443 CLOSE_WAIT 4060/python
tcp 0 0 :::22 :::* LISTEN 2968/sshd
tcp 0 0 ::ffff:127.0.0.1:33437 :::* LISTEN 5298/frmbld
tcp 697 0 ::ffff:127.0.0.1:33437 ::ffff:127.0.0.1:33439 CLOSE_WAIT -
tcp 348 0 ::ffff:127.0.0.1:33437 ::ffff:127.0.0.1:33440 CLOSE_WAIT -
[root@localhost ~]#
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jme

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Problem in form builder connecting to db

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