The forum post gives a translation, so it had been chosen as a reference. The post contains a link to your website, so there is no point to do it again in Wikipedia reference. However, both websites (forum thread and your website) does NOT give a reference to the source of these informations, i.e. interview with T. Karlsson, so these informations are unverifiable at this moment and this reference needs to be replaced anyway.
It doesn't matter, it is only a translation. The main source is at therion.metal.pl, this is the place where it comes from. I've just translated it, so you should place a link where the original article is. It is the same think as - writing an essay - if you took a part of some German book translated into Polish in the Internet, and wrote a note that it had been taken from
http://booksinpolish.com... Would it be a good note? What about its original source, title of a book, the author, ha?
Honestly speaking, it's not a interview in a right meaning of this word - it's a part of inner material of Dragon Rouge that I've translated from German. I have a contact with some people from this organization and - what's the most important - permission to use some of their stuff for the needs of my site. You don't have such permission, as well as Wikipedia. I think it's obvious, and it doesn't matter there is no reference at my site. I know where it is from, and some people know that too - others don't have to possess such knowledge. Next time be careful and think twice before you "take" (yes, it's only the euphemism) something that doesn't belong to you.
1. Read http://en.wikipedia.org/wiki/WP:FU &
2. Read http://en.wikipedia.org/wiki/Image:Therion-live.jpg This image or media may fail Wikipedia's first non-free content criterion in that it illustrates a subject for which a free image might reasonably be found or created that adequately provides the same information. Unless it is determined to be un-replaceable, the image will be deleted after Tuesday, 31 July 2007.
Please, don't force me to read all your inner stuff. There is something like law, and Wikipedia can only kiss authors' ass. I think that Mr. Brunsman could sue you at the court in Holland and your explanation wouldn't be too helpful for you. You would be accused according to Dutch law, not a law of Wikipedia.
Due to point #2, I've been deleted this image from the article before reading your post.
And I'm supposed to believe you? Naaah

Don't get me wrong, I don't really care about pictures not taken by me, but you should respect the (copy)rights of other people. I know you want to do something good (in your opinion), but "cloning" and making copies of something what may be found somewhere else is just pointless.
Once again - respect the rights of others and don't place anything at Wikipedia without permission of the owners.
And remember, it's not a big problem to ask for permission or information about the original sources of things you want to use.Cheers.