Locking and protecting

I have a large worksheet with many formulas. I'm trying to lock the cells that contain the formulas so that the users can't inadvertently key over one. The problem is that when I get done, I get a message saying that evereything is read only. I must be missing a step somewhere. Help.....

Thanks in advance.
gene

OK.....problem solved...!!!!
Now how do I add the "solved" message?