Hahahha yeah Trex is Bittrex and XD is a smilie reminiscent of someone smiling with their eyes closed ala a Japanese cartoon XD
If you don't already have an account at Bittrex, you probably won't be able to create one as they have shut off signups temporarily while they deal with a support backlog. How an exchange can take fees on that much volume and not have adequate support staff is beyond me, but the bar for corporate responsibility is set pretty damn low in this space!