To Use this project, click 'See inside' and in the first script in the first sprite the custom block creates a custom table. The idea of this is to simply be able to edit the table to make it look however you want. All the information you need should be inside the project in the comments I added. Make sure to read them. Also, trying making the project insert -1 rows or -1 columns. NOTE: The end of the custom block there is a section that says 'Enable Data entry from lists' and Then a 1=2 Boolean Input. Keep this the way it is, because this is still in development. When Finished it will allow you to give different columns and rows more/less space that others, and allow for more data to be input through items in a list, such as separate colors.
If you want to use this in a project of yours (Maybe as a high score table or something like that) please use it, but in the Notes and Credits (Thats the section of the project page this text is in) contains some sort of credit and a link to this project. Maybe you should add this into your backpack so you have it whenever you might need a table.