Click/tap Show to restore your view of the Timer. If you do not like working against the clock, select Menu then Hide at the top of the puzzle. The Timer indicated by the clock icon begins counting as soon as you start the crossword.
Once the square is highlighted, use the Backspace key to delete the letter OR click/tap on the square you want to change and simply type in a new letter. Click/tap on the letter you wish to delete.
