Thanks for the support and feedback!

Could you let us know which wallet you're using? The "Unable to Send - 'sig' not provided" error usually happens when the wallet is communication with the backend

Regarding the grayed-out Nostr login button, it means your browser isn't detecting a Nostr-compatible extension. To enable Nostr login, please make sure you have a Nostr browser extension installed and connected, such as Alby or another. Once the extension is set up, the login button should become active.