Hi mackenzie! I suggest you download the user manual found in Samsung Galaxy Discover's product page. You can find the download link on the right hand side of the screen. You can find the steps on adding a contact on page 85 of the manual.
Hope it helps! :)
Hi mackenzie. You can check page 85 to 87 of the user manual. If you don't have the manual yet, you can get it from the Samsung Galaxy Discover page.