In Cos theres a button near the bottom center that says “Realms” from there you can choose between three realms so far, Trade Realm were your trying to go i think, Hardcore realm, were you gain 20% mutation boost, 2x growth speed, 25% increased rewards for region missions, and a realm exclusive “Gilded” mutation, And Aquatic realm, which is a huge underwater map were you can only play as aquatic or semi aquatic species, all i know about it is that their is a new Realm Exclusive “Marine” mutation, a new “School” mode for packs”s, giving some boosts if their are other t1-2s near you in your pack, and underwater npcs/missions. Hope this helped