We couldn’t find any info on closing your account on the PokerStars website (which is bad). However, this tip we found somewhere might help.
Send an email to: email@example.com. Address the CC: address to your own email so you receive a copy. Put “Close account” in the subject line. Politely request to have your account closed and provide a brief explanation. Include your PokerStars username and email address that you used when joining the website.
Please share your experiences. We’re no poker players (nor we will ever be) so we cannot confirm the above. Greylisted for now.