(Screenshots might help?)
1. How to join
To join you'll need to be on a device where you can retrieve your emails
Go to https://community.purepla.net/ if you aren't there already!
Click on Register top right, you'll be taken to a form where you will be asked for your email, first name, last name and mobile number.
If you are a Pure Planet customer this should be the same email address you used to join Pure Planet, it does not necessarily have to be but if not and you later want to refer to your account when you post that is the best option)
It is possible to change your email later on.
Read the terms and conditions and click on accept.
You will be asked to set a username, (more detail and steps needed I didn't want to go through the process again to see what they were)it's best to choose a name which won't identify you as this is a public community
That's it you're ready to go.
2. How to log in
You'll need to log in only once, unless you choose to log out. Closing the webpage won't log you out.
To log in click log in top right, enter the email address you used to register then go to your emails where you will find a log in mail, open mail and click the log in button in the email.
3. Using the community
You'll find the guides to using the community here