If your 'TIME ZONE' is not correct you can change it in the 'SETTINGS' menu that appears on your main blogger screen. Make sure the time zone is correct so that your post launches when you expect it to.
Also under this same 'SETTINGS' menu are settings for 'POSTS AND COMMENTS'. Choosing to allow ANYONE to comment and NO for word verification will make it quick and easy for your visitors to leave comments. Blogger has some built-in spam controls and I have personally found them to work well but you can always go back and change this back after the blog hop is over.
The original tutorial is posted here and while they've moved things around a bit the new blogger is very similar to the old one in the basic way it works so it may be of help if you are totally new to blogging.
I hope this helps and I look forward to visiting everyone who participates in the OWH Memorial Day Hop this year!