You can join the community forums, where different user questions, feature-requests and bug-reports are discussed among IntelliJ IDEA users and our technical staff.

You can also post feture suggestions and bug reports to the YouTrack issue tracker.

In case of critical bug or problem that needs immediate solution, please contact support@intellij.com or fill in the support form. Double check that your reply-to e-mail address is correct and has no spam filters, otherwise we'll be not able to contact you.

Before e-mailing about a problem it's recommended to check that it's not already submitted to the tracker.