First, log in to your account. Once you're logged in, you would be taken to the exchange page and you see a pop-up window inviting you to connect your wallet.
If you don't see it, you can easily find this window in the top right corner "Connect Wallet" button.
Click the Portis icon (third from the left).
Click the "Connect Portis" button.
If you have an account, log in.
If you don't have an account, click "Create new wallet" and follow the steps. Once the account is created (usually very fast), login to your account.
Congrats! You're now connected to DINNGO.