Build information can be found by navigating to the Test Coverage primary tab, and then to Builds secondary tab. In the specific build's details window, click the info button on the right side vertical menu to expand the Info column. This info area will show the date the build was created and any included release notes.
Users will need view permissions in the test coverage module to perform this action. Depending on the settings of a users project permissions, users may be able to view all project builds or just a subset of them. Project owners manage the permissions for project members.