Welcome aboard! If the person you want to add is a family member of you, or of a person whose profile you have already created, I think the easiest way is just to go to the edit screen of the existing profile and click on whatever link applies -- add spouse, add sibling, add children, etc. If that doesn't apply, click on the "Add" menu at the top right of the screen and scroll down to New Person and click on that. Either way, you'll be presented with a screen with all the data fields for you to fill in with the info you have, and you just follow your nose through that. Then you do the fun part -- writing the biography and entering the sources. Don't skip that part!
If I'm missing the point of your question, please post again.