How much does it cost to use the Coin forum?

Excuse me, could you please clarify the cost structure associated with utilizing the Coin forum? Are there any fees for joining, posting, or engaging in discussions? Is there a subscription model, or is it a free service? Additionally, are there any hidden charges that users should be aware of? Understanding the financial implications of participating in this platform is crucial for me to make an informed decision. Thank you in advance for your clarification.