Normally, JCross upper-cases letters you type into the grid automatically. On the Manage Grid menu, you'll find a menu item Force upper case. This is a checkable item. In other words, it can be on or off; when it's on, its icon appears pressed down, and when it's off, it looks normal. The default is on, meaning that when you type into the grid, your letters will be upper-cased automatically. If you turn it off, you will be able to type lower case letters into the grid.