Where can i add informations to the next and already passed invoces?

Hi everyone, i need help.. And because there is 0% chance to contact support in my country by email or chat, which is triggering me, i am facing on the community.

Do anyone know, where can i add informations to the next and already passed invoces in bussines account?

In our country to have valid invonves we must include IC not only DIC, i cannot put it anywhere, so i need to add it manually probably by adobe? Otherwise the invoce is not valid.