Each publisher is a bit different, but the elements are the same.
Once you have found the journal article on the publisher's website, look for "Export Citation" or "Citation Manager". It may be above the table of contents listing, or on the right hand side of the article.
To include the PDF copy of the article in your EndNote library, attach the PDF to the appropriate EndNote record or follow the instructions to find full text through EndNote.
Change the file format to RIS format (for Reference Manager, ProCite, EndNote)
Select the EndNote library you wish to put it in
Your EndNote library will contain the selected entries
For the publisher Wiley InterScience
Select Format = EndNote
File Type = PC