It seems my portforwarding pages were similar to yours so I'm gonna explain what I do to get a server working:
1. open the page that you posted the pictures of and click this

2.click this..

3. Now on this page choose these settings and click next

4. now on this page choose these settings and click add

5. Now click this, or something similar like application sharing

6. In the first box choose Blockland (the name you gave it) and in the second box choose your network (it won't be what I have) Also remember to
tick Then click add.

7.Now we have to check our ports are open, go onto
http://portforward.com/help/portcheck.htm and download the free portchecker, then put these settings in and click Check me.

8. After you clicked check me it should look like this, if it says your port ISN'T open in red, you did something wrong.

Hope this helped, if it didn't its probably something to do with how you're sometimes getting it working and sometimes not...