You can't.
You can't rank up on a Minecraft server because there are no ranks unless the host of the server has a rank plugin.
ask the host to rank you up
It depends. You can't with normal minecraft but if you have a bukkit powered servers you can get plug-ins for that
If you want to rank up to builder in minecraft classic, you need to read the rules, or ask a moderator or admin, sometimes ask the owner him self! :D
An admin is a administrator of a Minecraft Server. They are of a higher rank than Moderators.
It should say before your username.
We are unable to answer that question because we do not know information about personal servers. You will have to ask the administrators/ops on the server.
Some servers have a rank system that allows you to go up the ranks. You can find out how to get promoted by seeing a server moderator or look on the servers website.
The Risk is that someone could hack your Minecraft server and get Owner rank, and they could probly find you IP adress
This is my opinion, Dyer. You may have DyeNade if you wish.
Minecraft doesn't mess up your computer. Minecraft is a malware free program.
I'd say under rank 50.