No prob! I did the same as you the first time I set it up, sitting there entering my usual Flickr password into the app, and wondering if the stupid yahoo login change had affected it.
I hate that they made me start using a Yahoo ID in the first place!
Anyway, to an earlier comment about Shozu. I've been a long time Shozu user, but with my recently purchased n73 decided to give the Nokia app one more try. The more I've used it, I find that it does some things better than Shozu, and not others.
Shozu advantages: auto uploading, also auto prompting you for upload (it'll ask if you want to send the photo to Flickr right after you take it). Also, uses less data... this isn't a concern for me, because I'm unlimited, but could be for some. The last advantage is that Shozu allows you to sync up with comments on your pics.
Shozu disadvantages: must keep a daemon running at all time in the background. If installed on memory card it interferes with USB Mass Storage mode. Has been flaky lately, not uploading everything I tell it too.
Nokia App advantages: Integration, of course. Also, the way that tags work is nice in some ways, makes me more diligent about tagging my photos (all you do is, on a seperate line in the body of the post, put "tag: trees, clouds, whatever"). More reliable when uploading.
Nokia App disadvantages: doesn't auto upload, doesn't background itself automatically while uploading (though you can do this manually of course).
Personally, I think I'm sold on using the Nokia app. It's been working very well the last couple days, and It's just one less 3rd party prog that I need installed.
-olly