To modify the information about your tables, you have to go to your Back Office > Configuration > Your Tables.
From there, you click in “new table” and you fill the fields: name, number of covers by default and even if it is a round table, the table will appear round instead of square. To save you have to click on "add".
If you need to delete it, just click on the red cross on the right
If you need to edit, click on the green table name.