Open 2DCraft Mod Maker by doing one of the following, if you are on the store version: Open the game, click Options/Mods/Make a Mod, if you are using the desktop version: Open a file called "2DCraft Mod Maker.exe".
Download 2DCraft Mod Maker for your version of the game and extract (only extract if it is a zip file, if it is not put it in a separate folder).
Download and Install MSBuild Tools from here.
If you have already done these steps and wish to make another mod, skip to step 5 after opening 2DCraft if you are on the windows store.
Versions 0.6 dev build 18/19 - 0.6.4 (Desktop version):
Do steps 6-26 of Versions 0.6 dev build 18/19 - 0.6.4 (Desktop version) tutorial.
Versions 0.6-0.6.4 (Windows store version):
Do step 4 of 0.6-0.6.4 (Windows store version) tutorial.
Select a world or create one if you do not have one.
I will assume you have downloaded the game from here and MSBuild from here.
Do steps 6-16 of Versions 0.6 dev build 18/19 - 0.6.4 (Desktop version) tutorial.