The most common problem in the old and new SBU. I don't know how to post images!!
1. click this button. Now you can upload your image directly form your pc.
2. Click 'search' ('bladeren' is Dutch for 'search'), and look for your image. I recommend using this option, since you don't need an url to host an image. If you do have an url, just select that box, paste it and the same screen pops up, shown in the next step.
It's up to you to decide wether you choose 1 or 2. 1 contains a link to servimg.com. 2 is the plain url of the image.
3. If you choose 2, click this button.
4. Paste your url, and the img code appears in the message body.
It's as easy as it sounds, huh?? It wasn't that hard right??