Lockring keeps on coming off

FixAxioN

Also one more thing i wanted to ask about: my backwheel is a bit buckled, when i was adjusting the chain tension last night, i noticed that if i pulled the chain too tight, the wheel would not spin a whole revolution because it touches the side of the frame... I also noticed a spoke which was loose and tried to tight it (by hands again!) but it seems the wheel is not 'true'. Any tips to fix that? :O

you really need to get some tools. get a crank brothers multitool (i've got the 17) which comes with everything you need (including a spoke wrench and chain breaker). as for getting your wheel true, you'll need to do adjust all of the spokes respectively to make the wheel round again. the longer you ride a buckling wheel, the worse it will get.