i can't join Contributions, i have donatet 1,99 and i can't join any Contributor

No idea

How long ago was it done? Being able to join them isn't instant, there is a wait while the site recognizes that yes, you have now donated $X of gifts.

If I were you, I would rethink my life and maybe found some new goals.

Try to sync

Wait 10 minutes. It will fix automatically.

Try to push power button and try again.

(Press Z or R twice)

Did you checked "Yes, I sent the prize"? Also, keep in mind that you won't be able to join ALL contributor giveaways, only the ones of the users who have contributed less or the same that you did (in this case, 1.99$).

lol 1.99? what did u give away DOTA2? and check if contribution is .01 or if its over 1.99 that's prolly why. Just because you contributed the price of some cheap 99c plastic.
Ok awfully sorry didn't mean to be rude. Just trying to sarcasm much

turn left.

It should work by now. cg said it takes 0-20 minutes for the system to catch up after it's marked as received. :)

Have you tried turning it off and on again?

It depends on the giveaway you're trying to join. Like some giveaways require $500 contribution value and if you only have $2, you wouldn't be able to join.