Well, first take a screenshot in game with Ctrl + P.
Then do whatever, quit your game.
Screenshots are found in Blockland\screenshots folder. You need to know where it is located, regardless of how you do it.
There are 2 basic ways to display an image on the forums:
Method 1: (
<br />1. Upload the file to some image host, I.E. Imageshack, Photobucket, Tinypic...<br />2. Get the link for it. If it has some kind of type for forums, use that.<br />3. Then post, and use [img] tags like this:<br />[code][img]http://www.imagehost.com/yourpic.jpg)
[/code]
4. done. enjoy.
Method 2: (upload to forums)
1. Begin to make a post.
2. Click the "Advanced Options" button on the bottom of the page.
3. A few checkboxes should have appeared, and a thing called Attach.
4. Click the Browse... button next to one of the blank fields.
5. Find your picture, and click open.
6. Make the rest of your post, DO NOT PREVIEW, and post. Your image will be attached on the bottom of your post.