You can't. Servers are run on a computer with a special program. You can make your own server though!
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It is completely possible; You need to get Operator on the server and type /stop. I suspect, however, you do not have Operator. Therefore, you would have to learn how to perform a Denial of Service(DoS) Attack or a Distributed Denial of Service(DDoS) Attack. Both of these methods are Illegal; It is not recommended to try either of them, as you can be brought to court for "Hacking".
If its your avatar its not the correct size to use it needs to be the same as everyone elses
noooo.
If you know there password
hopping someone elses fence to go swimming in their pool. (illegal) don't do it