Welcome to the London Poor Law Records project. Great to have you on board. Don't stress about any mistakes made - the ones mentioned above may not be anything to do with you anyway. I notice there are about 8,000 image sets in the queue to be reviewed and only about 1,300 image sets left to key. Isn't that awesome? Won't be long now before we actually complete the keying of this project - and with a new keyer on board such as yourself - it will be quicker still.
Unfortunately - once you've submitted a set you can't get it back again. So if you've made a few boo-boos, don't worry about it.
You'll find some much-asked Q&As about this project here - http://www.ancestry.com/wiki/index.php?title=Talk:World_Arch...
And if you have any other questions - then just ask on this board. You're miles in front of many other keyers - because you've actually already discovered this board. Well done.
Again ... welcome