You need to add a registrant manually?
Although you'll try to get all of your registrants to use your website to register for your event, some will still want to do things the "Old Fashioned Way." They'll ask for a paper registration form, or maybe just send you a text message that says, "Put me down for a foursome, I'll pay you later!" No problem!
All you need to do is register that person from the back-end of your website. So, go to the Event Manager control panel and navigate to the Registrants section. Click the blue "Add Registrant" button, fill out as much registration info as you can, and you're done! Keep in mind, you can change a registration anytime you need, so it won't throw anything off if your registration info isn't 100% accurate at this point.