AMBER6.0 HELP



Hello:
 I am a newer of AMBER6.0 and just try to learn how to use it. Maybe it is a
 stupid question but hopefully someone give me a help. My questions are 1) Can I
 load a pdb file of protein,  assign the residues with charges, and save the file
 as pdb or other type formate? if can, what's kind of charge it is assigned?  2)
 How to just add polar hydrogen (united atom) to residues, and how to assign the
 kollman united atom charges using AMBER6.0?
 I appreciate your help. Thanks.
 xin hu
 >
 > --
 > *************************************************
 >    Xin Hu
 >    Department of Pharmaceutical Science
 >    College of Pharmacy
 >    North Dakota State University
 >    Fargo, ND 58105
 >    Tel: 701-231-8298 (O)
 >          701-231-4360 (H)
 >    Fax: 701-231-7781
 >    E-mail: Xin_Hu[ AT ]ndsu.nodak.edu
 >               xxh0541[ AT ]hotmail.com
 > *************************************************
 >
 --
 *************************************************
    Xin Hu
    Department of Pharmaceutical Science
    College of Pharmacy
    North Dakota State University
    Fargo, ND 58105
    Tel: 701-231-8298 (O)
          701-231-4360 (H)
    Fax: 701-231-7781
    E-mail: Xin_Hu[ AT ]ndsu.nodak.edu
               xxh0541[ AT ]hotmail.com
 *************************************************