By default, when you install the game, for simplicity's sakes there is no dedicated lan or dedicated online server buttons. This is to help de-confuse idiots.
To host a server, you need to make a new link and modify the target.
1. Click and Ctrl+Drag your Blockland shortcut to create a link. Copy+Paste also works, just duplicate the icon.
2. Right click the duplicate.
3. "Properties"
4. Modify the target so that it says this: "C:\Program Files (x86)\Blockland\BlocklandLauncher.exe" -dedicated -map skylands
5. Ok
6. Use it.
This will launch a dedicated. It should look like the attachment when done.
If you're using a Macintosh Computer or installed Blockland in another directory, the exact target will be different.