Hi Umair,
Is this for an IDES system that you installed yourself? If so, you should have the connection information you require to set that up in SAP Logon. Basically you need the hostname of the IDES server, the System ID of the IDES application (the three-letter SID, i.e DEV, or SBX, or something like that), and the system number (probably 00). If someone else installed and/or is managing the IDES system, you should be able to obtain the connection information from them.
The same goes for the username and password. If this system was installed by someone else, they should be able to provide you with a user. If you installed it, then you should have been asked during the installation to set up a 'master' password for the DDIC user.
Regards,
Matt