To sell CTK Coin, also known as CertiK, you will need to follow a few steps:

1. Choose a cryptocurrency exchange: The first step in selling CTK Coin is to choose a cryptocurrency exchange that supports the trading of this token. Some popular exchanges where you can sell CTK Coin include Binance, Huobi, and KuCoin.

2. Create an account: Once you have chosen an exchange, you will need to create an account. This typically involves providing some personal information and verifying your identity.

3. Deposit CTK Coin: After creating an account, you will need to deposit your CTK Coin into your exchange wallet. This can usually be done by transferring the tokens from your personal wallet to your exchange wallet.

4. Place a sell order: Once your CTK Coin is in your exchange wallet, you can place a sell order. This involves specifying the amount of CTK Coin you want to sell and the price at which you want to sell it.

5. Execute the trade: Once you have placed a sell order, you will need to wait for a buyer to match your order. Once the order is matched, the trade will be executed and the funds from the sale will be deposited into your exchange account.

6. Withdraw funds: Finally, once the trade has been executed, you can withdraw the funds from the sale to your bank account or another cryptocurrency wallet.

It is important to note that the price of CTK Coin can fluctuate, so it is important to keep an eye on the market and make informed decisions when selling your tokens. Additionally, be sure to follow all security protocols when using exchanges to ensure the safety of your funds.