Right now the only way to report a bug is to put it here in the "share your ideas to improve Act!". Reporting a bug such as "decimal fields in company records can't be blank after you gave them a value" is lost in all the ideas which would bring new features to Act.
This is the best way to lose the bug reports and never have them fixed. Little bugs stay through versions and all of them together creates a burden when using Act. This multiple little issue burden has been reported by many many users through the forum.
Please create a specific forum for issues so that they can be seen and fixed quicker.