I didn´t quite get your post but I hope that´s about what you were asking for ^^:

well, LYB is your money for buying full sized versions of wallpapers...
you can obtain LYB by posting in the board or uploading pictures

you don´t get LYB for the uploading of pictures itself
instead you get LYB for everytime someone downloads a picture that you have uploaded
yet, first the admins have to check out the pictures you uploaded before they make them aviable to download for others
this can take quite some time (about 2 weeks or something untill they make your uploaded pictures aviable)

so just try to earn LYB by posting in the board, it´ll be faster that way