Don't get discouraged with finding others editing your contributions.  The website you added looks good, but you added it to a place in the article where it doesn't seem to belong.  Why don't you add it to the External links section and add a short sentence about its significance.  The format might be: 

 [http://www.dbsalliance.org/info/bipolar.html Depression and Bipolar Support Alliance] Has a good description of bipolar. 

 Again, don't get discouraged, you just have to get a feel for Wikipedia and try to write according to the (largly unwritten) rules.