@liszt333 have u looked online or in the my boots area on the site or looked on the talktalk tv site.
To save yourself time, please make sure that your community profile includes your first & last names, broadband phone number & if possible an alternative contact number. This can be done by clicking on your Avatar picture then click on "My Settings" followed by:- Personal Profile > Personal Information
Otherwise, TalkTalk will not be able to tie up your forum username to your broadband account. Only you & TalkTalk have visibility of your details.
I think Sky Sports USA is just a re-branding of Sky Sports Action which is why there was no delay in it appearing.
When new channels are added such as Mix and Racing are launched by Sky quite if and when TalkTalk customers get them depends on Sky agreeing to supply them and TalkTalk agreeing to carry them. All of which may involve discussions about money plus some techinical configuration if the money side of things is sorted out.