[Wombii]

This board doesn't seem to support uploading images directly, so you'll have to use an image host to have them show up.

imgur.com is one that currently works.

Create an account, go to yourusername.imgur.com/all
use "Add images", not "new post".
Click the image, select "large thumbnail" and copy the "Linked BBCode (message boards)" link. Should look like [u rl=https://imgur.com/r1cn1ba][i mg]http://i.imgur.com/r1cn1bal.jpg[/img][/url]. Paste it here.