Internet storage

The URL is an address of a storage location for your photos that someone wants you to use. If this is on your SD card and you DON'T want to use it - then scrap it.
If everything is working OK there should be video files on your card. These should have a suffix like .mts or .m2ts and can be dragged across into your Mac.

I think "Imageshack" is a piece of software that has been put there to make you spend money. If the video files are in a normally recognised format then work with them in your own computer.

Sorry I cant help more but I am a PC user.