If you mean that you want to keep up your server so that others can play while you arn't online then you need a dedicated server. To start a dedicated server all that you have to do is go to the main blockland folder "C:\Program Files\Blockland" and click on the bat file "dedicated.bat"
If you want to make a dedicated lan server for people at your home to play on than click on the bat file "dedicatedLAN.bat"
When you click one of the bat files a black command prompt window will pop up and act like your starting blockland but then blockland won't start, but the black window will be there, DON'T EXIT THIS WINDOW. If you want to join your server to load somthing or play on it then just click the normal button you use to start up blockland and join your own server by clicking join a server and find your server.
If you started a LAN server, it will be in Query LAN (click the Query LAN button click your server and click join.) If you started a Internet server than it will be in Query internet. But you need retail blockland to make a internet server.
If nobody comes to your internet server then ether people just don'w want to come or your blockland internet is not up. To get it up you have to forward the ports. Follow the directions here to do that:
http://www.blockland.us/portforward/index.htmlWow that was longer than I expected
