lashley - you wait until the solution to the appropriate puzzle is online, than click on play and you will see your solution in blue with any wrong letters in black.
e.g - for the solution to Jumbo Cryptic 1061 - use the search box, bottom right to bring up the whole page of Jumbos. Click on play and you should see your answers, etc as above.
When you first submit - you can submit with /without leaderboard. I use "with" and it immediately tells you how many errors but obviously not what they are yet.