ProTear.
You need to fill out information about your servers. Just posting the name and saying it's up is unacceptable. Look at mine for example. Also, to take screenshots you press control+p. They should show up in C:\Program Files (x86)\Steam\SteamApps\common\Blockland\screenshots.
The files will be named Blockland001 or something. When you have that directory loaded in Windows Explorer, open
http://imgur.com and drag the files onto the page. Then, once they're uploaded, right click on the image and "Copy Image Location" or whatever for your browser. You might want to open notepad using Windows key + R and "notepad" without the quotes, then use paste to see if you copied it right.
Now, once you have the image copied, you'll want to post it with image tags, see this example

.
That should help you.