Since you haven't yet identified or added even a parent, your best approach is to select the "Find" dropdown menu, then choose "Surnames". This open an index with links to every surname on WikiTree, and a search box. Enter "Pistorius" in that and it will take you directly to a page listing links to every Pistorius profile. Find an ancestor (or a guess) and open that profile. Look at those profiles ancestors (green bar links at the top will open a tree display). Also, the "Help" menu is your friend...Happy WikiTreeing!