We all make mistakes Lillian!
Sharon Fixed it up for you, but I wanted to help you find out how to take care of it yourself in the future.
Since you are the profile manager, all you need to do is go the Edit tab at the top of the profile, click it, then scroll down to the errant date field, click into it and type the correct date. Then scroll down the page until you see Save Your changes and save it. You will notice that there is a field above the save button for you to explain you change, "I flubbed to Date and fixed it" or "corrected date".
Also, at the top of every profile page on WikiTree there are drop down menu's, one of which is Help. You can navigate over to the Help Index to find other answers and help you might need.
Have fun WikiTreeing!