After you have created a DigitalOcean account and have setup your payment method. This will give a brief overview of some important items you should look at.
Network settings for DigitalOcean can be found under Networking menu option. This will provide a brief overview of some the Networking options.
To get to the Settings in your DigitalOcean account, you click on the top right icon to the right of the Create Droplet button. This post will give a brief overview of some of the Settings options.