I am creating a spreadsheet for my friend which has loads of formulas which does the confusing calculations for my friend so I decided to lock those certain cells.

I've followed a few instructions from searches on Google in order to do the above but now the sheet seems to be protected to a certain extent where the user wont be able to add or delete cells or columns which is what I'm trying to figure out while having the certain cells with formulas still locked.

Any help appreciated and just to let people know, I'm using the Excel 2007 which is quite new to me.

Thanks.