The dedicated server file is just the BlocklandLauncher.exe file with the argument -dedicated
If you can't find the dedicated server shortcut, make a copy of the BlocklandLauncher.exe shortcut and replace the target with this.
"C:\Program Files\Blockland\BlocklandLauncher.exe" -dedicated -map skylands
The -dedicated argument is what tells the program to launch a dedicated server rather than launching blockland normally.