The same way you level up your other combat skills, either the Soul Wars Mini-Game or Fire Giants at Baxtorian Falls.
by pressing block on you thing where it has the crossed sword press that and then it will say block and just keep fighting to raise defence
To level up your Defense, you must fight using a Defensive or Controlled style with a Melee weapon, the Long range style with a Ranged weapon, or enabling Defensive casting with Magic.
Raise your defense man, RAISE YOUR DEFENSE
I'd sujest hill giants
Fighting more, maybe to to the graveyard.
Make runes. Air, Water,...
40 Defense? sure why not? =)
Castle Wars Armour:Red - Has Defense equal to Steel.Silver - Has Defense equal to MithrilGold - Has Defense equal to Adamant
99
raise defense
Try to do stuff that requires your current level.
The best armor to wear in Runescape I would say is Bandos, mainly because a nice combination on Strength bonuses with Defense.
In RuneScape? No, smithing does not affect your combat level. Your combat level can be affected by the following skills: Attack, Strength, Defense, Constitution (formerly called Health), Magic, Ranged, Prayer, Summoning (for members). Search for an online RuneScape combat calculator to quickly see how the different skills affect your combat level.
just use that option under the crossed swords.