Hi Blackbladez,
You need to enter the address you are sending the BTC to first, in the recipient bar at the top of the send screen.
After that you'll be able to select the wallet you want to send from.
Bitcoin.com is just one domain name used to promote Bitcoin. Bitcoin.com is not an official website. Just like nobody owns the email technology, nobody owns the Bitcoin network.
As such, nobody can speak with authority in the name of Bitcoin.