satyesu - you seem not to know many of the basic game controls with which most players are familiar. May I suggest that, instead of filling the forum with posts requesting this kind of help, you search the FAQ thread and read the Civilopedia (access via the red ? icon at top right of the map screen), or alternatively send me a personal message (click on my user-name and follow the instructions). I do not claim any particular strategic expertise, so I won't attempt to tell anybody what to do, but I do reckon to know how things are done, and I have plenty of time to answer questions about this.
The same goes for any other forum members in a similar situation.