If you want to donate, just send your bitcoin to the btc address of the one you wanted to donate to. If you are asking how to donate here in the forum it has already been answered by the earlier posts. You can earn coins or tokens his joining bounties opened by ICO's and obviously you will get their token as reward for joining into their campaigns whether it be signature or social media. You can also earn coins and tokens via airdrop if ever there is one, for more information regarding this, go to altcoins section you can find them all there.