Click on areas of the image for more information
Editing a word
To edit a word simply select it from the grid at the top and make the changes from the boxes underneath. Remember to "Save" the word when finished.
Sorting
To sort the click either the 
button for ascending or 
for descending. Columns can also be sorted by double clicking on the column header. Each time you click it toggles between ascending and descending order.
Favourites
To add or remove a word from your favourites list just check or uncheck the box in the favourites column
Delete All Words
This will delete all words in that set. You will first be asked whether to removed all words permanently or send them to a "Removed Words" set. You will never be testing with words that have been removed.