To show a certain cell, select the cell in the cell hierarchy in hierarchy browser to the left. Then, right-click in the cell tree to bring up the context menu and choose "Show as top" or simply select the cell with the middle mouse button.
To select a cell by name, choose "Select Cell" in the "Display" menu. A dialog will appear that allows selecting a cell by name or choosing it from an alphabetically sorted list. Additionally, this dialog allows navigating the cell tree by moving to one of the child or parent cells.