Actually, im just new to dftb+, i study many articles and also the manuall for dftb+ of Material Studio , but still so confused about this matter, i wanna to study the adsorption of water on Au and Ag nano surfaces by dftb+ , how can i make a new parameter set that can be available both for Au and Ag with water elements?, then to can compare the adsorption energies??

I was very thanksful you are considering my problem And also many thanks because of your consideration.