You'll have to upload the image to a hosting site. I know Suz uses Flickr but I personally use imgur since you can do it without an account, and usually after uploading and posting pictures I tend to forget about them entirely so it's win win.
Then you can do one of two things:
1) When making the post there's a "Insert/edit image" button right above the area you're typing a reply/post. When you click it in the source box enter the "Direct Link" URL that the hosting website gives you after you've uploaded your picture. ex:

2) Most hosting websites also allow you a BBC code for Forums and Message Boards but I find it doesn't always work:

Edit: Hell I had to edit to fix it lolol. Best just use the Insert/edit Image button.
Also Gnomes is too low level to run warbands. Sorry about that bro. :(