i didnt add a button for that - my bad, i'll add for 1.3
here is how to do it manually
on the left is a list of tables
double click on GlassTbl to open it
click on the little down arrow shown and select sort largest to smallest - because this is an automatically generated number it will give you the last ones you entered
find the one you want and then
right click the grey square on the left - this selects the whole row/record and gives you a little box with a delete option
select delete and then confirm the deletion
done!
close the table selecting yes to save when it prompts - this isnt needed to confirm the deletion just that you've changed the layout of the table, which isnt important anyway