Hello sudhir sapkota,
Since nobody has done so yet: Welcome to LQ, just to be polite, not to take a moderators job away
First of all, if you want to connect to the internet you should stay calm at all times and take a deep breath of air.
Then secondly, please do what karamarisan already asked, provide us with as much information as possible. Without it only a clearvoyant can help you.
So, start all over, you already stated that you installed Fedora.
Are you using a GUI (Graphical User Interface) or command line interface?
What commands/options have you already tried and what where the results of those commands?
Did you check the obvious? That a cable is connected to a router/switch/hub? Or are you trying to connect using Wireless?
So you see, the more information you provide, the quicker someone can help you on your quest for knowledge.
And please, please, please, use sentences like karamarisan stated. Just using incoherent words does not make any sence.