You have to log in with your binance id and password, click here. If you don’t have a binance id, you can click the “create a new account” button on the top-right of this page. You will need 2FA on your binance account as well. Text this code to 81010 if relevant: ETXYTFY7Y
The wallet for buying from Binance is an exchange Multi-currency wallet which you can use wherever Dash is accepted. In some countries it’s possible to buy directly from Binance, thats why I am putting that link above as its easier (and less confusing) for people here then creating an account at binance. Anyway i hope that helps!