I'm pretty sure those coins are a bonus on top of your membership. You should become a member if you paid, maybe just wait for the update, up to 8 hours. A lot has changed since I joined though and this might be slightly inaccurate, I'm sure someone else will clarify or confirm.
Post this in the 'help' forum Fred seeing as no one is helping here. It may be that you need to spend 30 of those 90 coins to register as a member, I really dont know the rules for new comers now, sorry. I'm certain it will get sorted out though, be patient with the game.
Authentication ErrorYou can only post messages if you are logged on as player of simcountry. You must also have a country in one of the worlds. New members can join the forum about 48 hours after registration.
If you login with email address and password at https://www.simcountry.com, you will post under your registered First- and Lastname.
If you login as President or CEO in a simcountry world, the name of the world will be displayed with every Message that you post or New Conversation that you start. This is preferred if you want to discus 'world' related subjects as Trade, Federations and Common Markets.