How do you get my defence level up quicker on runescape?

Fight in the Defense style first of all through the combat menu.

Fight creatures that have high hitpoints or regenerative qualities like monks or Experiments or Dragons.

With monks especially they can hardly ever hit if you have more than lvl 10 defense and they regenerate very rapidly with their spells, so I've heard of people training their accounts to 45 defense when they step off tutorial island just by purely attacking monks while in the defense style. And due to their low att and str the account will almost never kill the monk allowing the account to stay logged in for very long periods of time without the need to be sitting there clicking on stuff.

Gary Laurens {Just_a_plaeyr}

i think you should kill rock crabs or other players max them and make sure they have food.

cocowheats87 (plays runescape) and Gary spelled player wrong lol add me if you need more info.