How do I superimpose the GPS co-ordinates onto the pictures I have taken whilst using the Canon SX260 HS once I have downloaded the JPEG, CTG and GPS Log files onto a computor.

I know this is a couple months old... Posted on my birthday coincidentally... And I know that the OP probably won't see this, but...

You could always use a paint program or other photo editing software to put the GPS coordinates in the picture... You would need to see the coordinates from the GPS log and either copy/paste or just type them in... Likely in a bright yellow near the bottom of the image...
:D