This is an early alpha release of the Lightning App running on Bitcoin mainnet. To try the release, just do the following:
1. Install the app and follow the setup instructions.
2. Send a small amount of BTC to your wallet address (not more than you are willing to lose, it's alpha)
3. Wait a few minutes for the wallet to sync. Once completed, the app will open payment channels automatically. The funding transactions need to confirm just like regular on-chain transactions.
4. Go to a site that supports Lightning like Yalls and buy something: https://yalls.org
General usability feedback is greatly appreciated. For a list of known bugs see: https://github.com/lightninglabs/lightning-app/issues
If you find a bug, please check if a GitHub issue already exists. Otherwise feel free to open a new one. Screenshots of the logs screen or the bug in action are very helpful.