When can I start buying eos tokens again


Hi all
Pretty much as per the title … + if I buy more tokens on an exchange (there available now as eos) how does that actually work when it comes to me owning them (the keys) to transfer into my current wallet that I have on scatter or do I just create a new account or what ? It quite sure and I would love to get more not quite sure why they have them listed as eos please help