Whiteface......aka White Widow

Select the week you want to edit and above the pictures, just below the -weeks- section, there are 2 buttons, edit week and remove week. Edit week will allow you to change whatever you want in said week.

You can, there is an "Edit Week" button. Once inside you can change the week you're editing.

You probably clicked the "Edit Diary" button which won't help you at all. Good luck!