Click the (+) button to add a new row, input the user's accurate information, and hit the "Save" button at the top right hand of the screen. When the person you've invited receives their email, they'll be able to sign up and join you in editing models in Sturppy. While we did intend this feature to be for coworkers to work together on a model, we have seen it used to share with investors. Just keep in mind that invited persons are counted as part of your accounts user count, which varies by plan type.