If you haven't fully accepted the Freedom partnership, I,e not been sent your learn more button then you aren't in the network yet and as such as free to choose a new network or even go it alone if you wanted. If you have been fully partnered with Freedom, as outlined above you will have a 'remove access' button on your Youtube status and feature page which you will need to press and then wait 30 days to be officially unlinked, as per the contract you agreed to.