enter C:\Users\Username\Documents or C:\Documents and Settings\Username\My Documentscopy the Blockland folder to said flash devicecopy Blockland folder to C:\Users\Username\Documents or C:\Documents and Settings\Username\My Documents on the new computer
You can use a USB flash drive, I used one with 4gb.Dont do it for everything though. If you redownload blockland on your new computer and put the save on and it has addons you used for it,You're going to have to redownload the addons, colorsets, ect.