Deductions & credits

MY QUESTION CONCERNS DISTRIBUTION IN THE FORM OF A DIVIDEND FROM CANADA, WITH A BROOKLYN, NEW YORK ADDRESS.  THERE WAS FOREIGN TAXES TAKEN OUT AND I WANT THAT AS A CREDIT AGAINST MY FEDERAL TAXES.  YOUR PROGRAM SAYS I HAVE TO FILL OUT TAX FORM 3520, I'M COMPLETELY LOST.  ALSO WHERE DO I PUT WITHHOLDING TAXES FROM AN INTEREST STATEMENT?  THANK-YOU JWH