The email step is the whole signup
The form on simpcity.es is not the hard part. People finish it, feel done, and then discover the account will not sign in because the confirmation never got opened. That link is the account. Until it is clicked, you have a username on paper and nothing else.
Use an inbox you can reach from the same phone you are signing up on. If the message is slow, look in junk and in any promotions tab before you request another copy. A second mail does not cancel the first, and hunting through three identical messages is how people click an expired one.
Pick the username you can live with. Changing it later, if the board even allows it, confuses anyone who already replied to you. A strong password that you do not reuse matters more than a clever handle. Write the password down offline if your memory is unreliable. Do not put it in the same thread where you introduce yourself.
Once the link has been opened, sign in once and leave. You do not owe the community a post on minute one. The signup section on the home guide has the same steps with a little more room around them.