How do I "clone" an area?

[jebdesigns]

I am new to restoring photos. I took an on-line HP class and learned a lot, but can not seem to figure out how to clone one area to another.
My mother-in-law passes away last week at the age of 89 and the family would like me to "fix" a photo of her as a young women. It seems to have watermarks or spots of some kind all over it. I have tried using the "fix flaw" tool but in some areas I really need better coverage.
Any assist would be greatly appriciated.
I have HP Photo essentials, Printmaster 15, and Photoshop 11.0 programs.

Thanks
PS as suggested I have attached the image

[mistermonday]

Welcome to RP! Sorry to hear about your Mother-In-Law. Depending on the image and the stains, some techniques and tools may be more effective than others. I suggest that you attach the image or a part of the image which is representative of the damage so that you can receive the most useful suggestions.
Regards, Murray

[Bob2006]

It would also help if you posted the Photoshop version you are using. If it is a fairly recent verson you could likely use the patch tool to clone in large areas.
bob