Click on the "control panel" button (upper right corner of the page, right of the Classifieds button). About halfway down, there is a text box under the "Signature" heading. That box is where you need to copy the html code to in order to get the data from your weather station to appear in every one of your posts. It is very important to have the proper beginning and ending symbols to get it to work correctly.

I will try to post the code from someone else's weather link:

<span style="display: block !important; width: 320px; text-align: center; font-family: sans-serif; font-size: 12px;"><a href="http://www.wunderground.com/cgi-bin/findweather/getForecast?query=zmw:00000.18.10416&bannertypeclick=wu_clean2day" title="Unna, Deutschland Weather Forecast" target="_blank"><img src="http://weathersticker.wunderground.com/weathersticker/cgi-bin/banner/ban/wxBanner?bannertype=wu_clean2day_metric_cond&airportcode=EDLW&ForcedCity=Unna&ForcedState=Deutschland&wmo=10416&language=DL" alt="Find more about Weather in Unna, DL" width="300" /></a><br><a href="http://www.wunderground.com/cgi-bin/findweather/getForecast?query=zmw:00000.18.10416&bannertypeclick=wu_clean2day" title="Get latest Weather Forecast updates" style="font-family: sans-serif; font-size: 12px" target="_blank">Click for weather forecast</a></span>

The above code will create the following image:




Click for weather forecast



If you post your code here, I'll see if I can find any mistakes that might be preventing it from working.