Your feedback is important because it helps us improve Cardano and the testnet. We have an active Telegram communication channel and a technical support desk to help with the process.
You can reach the developers of Cardano directly at the Telegram website. Just join the @CardanoDevelopersOfficial channel.
To contact IOHK Technical Support, please submit a request using the Submit a request form. You can also click on the Support button at the bottom right of your screen. The request form is better if you have a lot to write.