Yes, you can, to do this.
- Log in to the Community Forum
- Navigate to my Profile
- Select hide from the drop down list on display name options
Disclaimer: If you hide your name this hides for ALL posts/answers on the Forum under your account, including previously posted ones.
If you select 'Hide' and then at any time after you switch to 'Show First and Last Name' or 'Show First Name' this will change ALL posts/answers (previously posted anonymously) to show your name.