Hello there hopefully I can help -
elrue - enchant 1-3 (circle ones)
lix -enchant 3-6 (fire ones)
xir -enchant6-9 (water bottle looking ones)
You go to any black smith click on them and press 'enchant item'
You'll then get a screen with a clock looking thing.
Put your weapon that you want to enchant in the middle (If your weapon hasn't been +'ed use elrue on any of the other squares)
And then press echant - If you see a star on the oppisite side of the elrue then the enchantment was complete you have +'ed your item