Hello @Lilac,
Welcome! 
I’m Bry, one of the moderators here in the forum and an Eclectic Witch. Just stopping by to say that it’s a pleasure to meet you!
We take everyone’s privacy and their safety very seriously here- if I can clarify, there are a few ways to control who sees what when it comes to your name!
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The first name/last name you enter when you sign up in the newsletter is just for the newsletter - no one can see what you enter there (unless you share your newsletter- it will be personalized to you)
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There is also your Spells8 Account Name - this is the name on your Spells8 account. It can be changed at any time in your account on the main Spells8 site.
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Finally, you have your username here in the forum. This is how most people will refer to you around the space. It can also be changed.
For more details and step-by-step screenshots about how to change your names/username - feel free to check out this guide!
→ How to Change Your Name and Username on Spells8
Additionally, as Devenne kindly mentioned, there are two categories here that are reserved for the coven community and can only be accessed by those who are currently logged in. These categories are A Sacred Space and Energy Exchange. It is recommended that any sensitive or personal information be housed in those coven-member exclusive categories 
Make yourself at home here, Lilac! Everyone is very friendly and supportive. If you ever have any questions please don’t hesitate to reach out
Blessed be!