well this is old hat method, but basically what you do is build 2 accounts, answer as many questions as possible, will take a few days to do this, and you will need to reach level 2 on both accounts, only after which you will be allowed to post links.
Then you ask questions from multiple new accounts on YA, and rotate the 2 L2 accounts to answer them with your links, and when the time comes, login to the new accounts that you used to ask the questions to select your l2 account answers as the best answer for eveyr question. Create as many l2 account as you can, be clear and honest with every answer, sound like a real human being, not like a disconnected bot that doesn't put its heart into the reply