I am not sure if this is the tutorial you followed, if not I would recommend checking this one out.
If you did not set up your droplet with ssh-key based authentication you should receive an email with a default root password. With this you should be able to log in with the following:
Host: Your droplet’s IP
Password: Password that was emailed to you
When you first log in you will be prompted to change your password. After entering your password you will be asked:
- To enter the temporary password again.
- To enter a new password
- To re-type the new password
Once this is done you will have access to your shell.