Step 2: Make Table
The web site made your puzzle, so all you have to do is make a similar table in your document. Open a new document in your word processor and insert a table with the same dimensions as the puzzle.
In MS Word: 罫線 > 挿入 > 表
In OpenOffice: Table > Insert > Table, or Ctrl+F12
There should also be an icon on the toolbar for creating tables.
The web site made me a puzzle that is 12x14, so I put in a table the same size.
Documents showing the steps outlined here are available in OpenOffice and MS Word formats here. These are the ones used for the pictures in these pages.