Open Nxt Client - Open your browser and go to http://localhost:7874 or https://localhost:7875 - Click the "Lock" icon in the upper left corner to unlock your account. - Enter your passphrase or if you don't have an account, enter your new passphrase. Make sure you use a very random, complex password of at least 30 characters. You can use 0-1, a-z, A-Z, special and national characters.