Unanswered questions in twitterfeed tagged with twitterfeed

We couldn't find valid date/time stamps or GUIDs on items. Please make sure your feed contains valid pubDate entries or GUIDs for each post

How do I make my feed ignore comments on my blog? I have the feed set so when I post a new blog update, it sends a twitter out. Well, on that same blog, I have a section that updates whenever someone comments. How do I make is so it does not send out a twitter of that person's comment?

I signed in to twitter using Open ID, so I have no password. How do I set up a twitterfeed which requires one?

I have added two feeds at Twitterfeed:

http://feeds.feedburner.com/Aftenpost...
http://feeds.feedburner.com/Aftenpost...

These will be included in the Aft_Reise user at Twitter. However, even though I know new items have been posted in both of the feeds, these are not reflected in the Aft_Reise user.

Why is that?