...ok ive just bought a pack of hair extensions, the kind that you plait in....i dont actually want to braid my hair....n i wasnt sure if i could use these or not...

yet i still bought em lol...but anyway

what i want is to make my hair a lil thicker.....is there a way to make these stay in without having to braid all of my hair?....ive tried to plait it at the roots and go down only a lil way but then i cant get them to stay in....or stop them from untangling at the bottom...is there a glue or something that i could use?....both at the top and bottom of the extensions?
but i dont want to spend to much money on it because i dont know if i would like them or not yet, which is why i didnt buy those clip in thingys or go get it dun at the hair dressers...
any advice??

....thnx in advance :)