Excel/VBA problem

When I use VBA (only in Visual Basic Editor), everything I type will go to a little box at the bottom of the screen, then it will go to the worksheet if I hit enter. I can't type directly in the worksheet.

Both my Mac OS and MS Office were updated to the newest version. I tried to shutdown and restart but it usually didn't work. ( I said "usually" because sometimes it works, but sometimes it doesn't. ) I tried to google but I didn't even know how to call this problem! Even my ISys Professor doesn't know what happens to my excel.

Here is the picture:

If you know how to fix it, please let me know. (Any suggestion about how to call this problem or whom I should ask is welcomed, too! )

Thank you in advance.