As you may know the website currently is quite limited in it's possibilities and tools. The devs are working hard on V3 (we're in V2 now) of the website. This version is very likely to have these moderation tools available. I however doubt they'll let us remove our own stuff.
tl;dr; Wait for V3, unlikely they'll do it now.
Hey DavanOrdanska, if you PM me the threads you would like deleted, depending on their content, I may be able to help you.
While the version of the website is limited I have seen individuals 'edit' their post by removing everything and typing "Please Delete Post" or "Duplicate Post". It is not a guarantee but it is an option to at least try.
"Count Eldric Blackmoore of The Haven, offering direct support for the Hunters, Explorers and Gathers of Elyria"
Top right hand corner of your post, click that and tell them. That's most likely the best option. 