You have to be a Jr. Member at least and registered before December 1, 2017 and if you have both the prerequisites, you should have minimum 100 Onions in your wallet to apply for our weekly main Friday's airdrop.  We have another airdrop, which happens every Sunday and here you need not have any prerequisite, you just have to participate in our official DeepOnion forum https://deeponion.org/community and you get Onions with your DeepPoints you get according to your various activities.