You must write in the international bug tracker according to the rules.
http://forum.pandawow.ru/forumdisplay.php?f=175
[spoiler=Example]
1. Name of not working spell/quest/npc etc Necessarily add a link to WoWHead
2. Description of the problem. Try to explain all as best as you can. Describe what is not working exactly. Add proofs of your words - usually attached screenshot or the combat log - is enough.
3.How it must work. Necessarily give examples with the link to WoWHead, WoWWiki or WoWPedia. You can use any evidence, the main thing that it isn't your opinion, but official data from the official server WoW.
4.Date when you tested it.
5.Realm (x100/x5/Fun), on which you have found the bug.
6.Priority of the problem. (1-10) It doesn't mean that if you will write 10, then developers will work on it in the first place. In the sum, we are creating our own priorities.