Ok...well first you get the picture you want to Image2Brick.
Then, drag both the .exe program and the picture out of the .zip folder.
(The pic has to be .png)
Then, drag the picture on top of the .exe program and let go. It will start the program with two options.
The first option is vertical like I made mine. The second option is horizontal, flat.
Type the number and press enter. Then press any key to close the window. When you're done with that, put the created .txt file into your Blockland/config/client/macros folder from the Macro Saver.
Then, go into the game and load the macro and start macroing. If it is the right colorset from the .zip file, it should build properly.
So...that's how to use Image2Brick :D
EDIT: When you macro at any time, not just in this, you cannot move in any way or it will mess up the macro.