INstalling IBM Rational Doors

 Hi Muhammad,

After installation, you have to start Jazz Team Server and then use any web browser to access https://localhost:9443/jts/setup

 Only RTC has desktop client, hence the icon on desktop.

Obvious question first - have you read the installation instructions? If you downloaded the installer, it provides links to installation instructions, which are very comprehensive. Generally, you just need to follow them, making note of a few things like user names and passwords. If you are installing for personal use, that is normally all you need to do. Once you are sure that you have successfully installed, then, as Howard said, you need to ensure that you have started the Jazz Team Server (actually, this is part of the installation instructions, but I repeat it as you need to ensure it is started each time you want to use any if the Jazz tools, including DOORS NG).
Assuming you are running on Windows, you will need normally to start the Jazz Team Server in Administrator mode. It should install a shortcut on the Start menu:

Start -> Programs -> IBM Collaborative Lifecycle Management -> Start the Jazz Team Server

Right click on the shortcut and select "Run as Administrator", as in the screenshot
Depending on your operating system and user privileges, you may need to enter your password.
Wait for the terminal window to show something like "server started in NNNNN milliseconds", then you can continue as Howard said.

Please check if port 9443 in listening state.