The first setup is not too bad. After you use the mobile to do the initial Bloom Sky setup, the Bloom Sky server "knows" your unit's number. When you sign up at bloomsky/wun, it populates that number for you.
My BloomSky WU station is acting up a bit. It might be a WU issue. It used to be, the BloomSky pic showed on the front page with the data graphs. However, now the first page shows some old dark image all day. But, if I click on that image, WU goes to the latest ftp webcam pic. Odd.
Also, my second station (which uses the WU URL webcam) shows the updated pic on the front page of my RainWise station. That was originally my main goal, so it's just another glitch, not a terrible problem.