Where is the "Hint" button, etc.?

These puzzles are good but very, very hard & I am an expert crossword puzzle solver--I do them all the time & know a lot of obscure clues that are used but some of these are ridiculously hard! I have one question--I just downloaded this app so where do I find the hint button, clues button, erase error button,etc. I only see the puzzle with NO options on it! Thanks!

PJCRAC73 about Crossword Light