Instructions:

  1. Select the cell or cell range you want to hide

  2. Go to tab "Home"
  3. Click "Format"

  4. Click "Format Cells"

  5. Click "Protection" tab
  6. Click checkbox "Hidden"

If this doesnt work, make sure you have done the following:

Protect worksheet and contents of locked cells

  1. Go to tab "Home"
  2. Click "Format"

  3. Click "Protect sheet"

  4. Enable "Protect worksheet and contents of locked cells"