You would not really merge with your aunt Carolyn. Eventually you would add her to your tree after you added your immediate family members. This link will explain how to use WikiTree:
PS: Don't forget to re-check the "guided tour" message to help you learn how to use WikiTree, that they sent you last week. Your first stop was https://www.wikitree.com/wiki/How_to_Start_Climbing_Our_Tree
I sent you this week's message which is also posted on your page earlier this morning!!