Meta Tag Info

I am posting some things in Facebook about my website and when I post my company website, it shows one of my picture and it tells about CS-Cart. How do I remove the cscart information and put in mine. I have gone crazy looking everywhere on how I can do this. Thanks for any help!

design/blocks and click the small cog/gear icon at the side of the block name tab, then enter meta info in thereā€¦check homepage and all pages block tabs