I put the ore into the slot in the module,and the oredict name displayed.
However,when i reopened the gui of the module,i found that the oredict name was not added
there're no buttons like ok or cancel.

you see oreGold on the right, there it displays all oredict tags of the item, this this case there is only 1, you need to click that to add it to the list below that is saved

Thanks... I'd better close this