Wont allow a lock code

While the app looks ok, the "Done" button on the enter-lock-code page is un-clickable. What is the point of having the option to enter a lock code, if it wont take. This makes my diary useless. I could just as well use Notes for free if I didnt want it to be private. Please address this issue and I will change my review.

Aylavue about My Secret Diary, v3.3