Do not get a Private Key in your MyEtherWallet in any place. Do not give Airdrop / Bounty Form.
What do you mean with that ? confused 
make sure the ICO coin have listed on exchange(youbit/coinsmarketchap/ED.. Etc) then you can easily sell it like usual. or open youtube or search what do you need.
i think he meant by not to mistakenly give out your private key to any airdrop/bounty forms when registering.