In this tutorial, we learn how to lock and unlock cells in Excel. First, right click one cell and click on format cells. Go to the protection cell, and then un-check the locked category. Click ok, then go to protect sheet, inside of tools. Now, do now allow locked cells to be checked. Now, you will not be able to select cells in the worksheet except cells that are unlocked. This is a great way to protect your information, so it won't accidentally get deleted or ruined. You can do this for entire columns, or just one small area. Make sure to save your work when you are finished, then unlock if you want to edit!