Watermark problems

I was going to do such a lot today, my daughter has sold me her camera as she has just bought a fantastic new one, I have photographed a few cards and some new stock for my gifts website www.giftsandpieces.co.uk

     Well I downloaded the pictures to my computer then tried to find a free program to put a watermark on my cards,  I,ve now tried two programs and just can't get the hang of it, I also have a problem that I have been trying to sort out for weeks,

  When I try to open a document it tries to open with Internet Explorer and I have Google chrome as my prefferd site the screen just keeps flashing and I have to close the computer down  to get out of it,  I have looked at everything and cannot sort it out.

    So I give up,    any way here are the recent cards that I have made this week, using decoupage sheets that I have had for awhile, I really must use what I already have before buying anything else, also I  am wondering whether to buy a new die cutting machine  I have the original cuttlebug which is great but would love a bigger machine.
   Here are my non watermarked cards