You can see everything in the community without signing in. But if you want to post questions, or answer questions, etc. you need to create a community account first and then sign in.
Click Register on the top right hand side of the site.
First enter the email address you want to use. You can either use:
Once you enter the email, click Next.
Then you will be asked to enter some more information on the next screen.
Then click the checkbox to agree to the terms of service, privacy statement, and code of conduct.
Then click I'm not a robot and click Submit.
Once your community account is created, in the future if you need to sign in, just click Sign In in the top right hand corner.
If you have questions about registering for a Community account, please visit the community account support article.
Please note that when you register your Community credentials under an organizational account, you will be offered a streamlined personal data management experience through your organization. Actions initiated to export personal data, delete personal data or account closure now need to be initiated directly with the administrator of your organization. After the transition is complete, your ability to access or delete your personal data will be administered by the organization that owns your domain. Although Microsoft continues to be ultimately in control of your personal data, you need to contact your organizational administrator to manage it. Organizational administrators can put in an export or access request to their Admin portal and a link will be available to them to download your personal data in less than 30 days.