I have exams these days so how can I stop the online games ?  

anyone know how can I do that ? please hurry up ..

Go on vacation I guess.

where I can get this vacation

My Home -> Account -> Online Chess Settings

There is a checkbox under the header "Vacation" beside the text "Pause My Games".

Be sure you go to the bottom of the page and hit "Save Preferences >>" once you've checked the box.

Go to "My Account" then click "Online Chess Setttings"  then check the box that says "Pause My Games" then check the box that says "Save Preferences".

if you are going to be too busy for longer than the time you have on vacation then you should resign and/or offer draws to your opponent.

ok thanks for all