Where is my twitter id number?

I think the page they're taking about is http://twitter.com/badges (no "account" in the URL), and you'll need to be logged in to see it.

You can also get your Twitter User ID this way:

1. Go to your own Twitter home page -- http://twitter.com/home (you'll need to be logged in).

2. Scroll down to the bottom and look for the little [RSS] box at the bottom of all the tweets.

3. You can hover over the [RSS] box and look at the URL that appears in the lower left corner of your browser, OR You can click on that [RSS] button to see the RSS feed load in your browser. Your Twitter ID number is in that URL.

For example, if the URL is:
http:// twitter.com/statuses/friends_timeline/5235151.rss

Then the Twitter id number is 5235151 (the number that appears before the ".rss" in the URL).

Hope that helps!