To remove forwarding, simply change your domain settings. It is not always possible to delete settings, but they are easily over-ridden. If you no longer wish to forward, you could set Name Servers, create an A record, return to parking or whatever you wish to do. You can access the setting options by following these steps:
1) Log into your Dynadot account. 2) Click on the "Domains" tab in the main menu. This takes you to the Manage Domain Names page. 3) Click on the link listed in the "Name Server" column. After the page loads, you should see your current settings
If you are forwarding, you will see an * on the 'Forwarding' tab. Once you have successfully altered your settings, the * will move to indicate the active tab.