Hey there! This should actually be posted in the Runescape Markets Section.
Now you're going to want to find the sub-forum that it links to right here. http://sythe.org/forumdisplay.php?f=255
I've also noticed that you have some incorrect formatting on your selling post. Some things that you should include:
Pictures of the login screen
Pictures of wealth and stats
Trading methods
Any sort of starting price. [Optional]
If you need any help at all, feel free to send me a private message.
The guide in my signature will also be quite helpful.