Signal doesn’t provide the email addresses to investors. Signal is designed to help you see the connections within your network to VCs who align with your stage & sector. Additionally, Signal can help you identify VCs that invest in your stage & sector.
The fastest way to get in touch with investors you find on Signal is via mutual connections. If you connect your Gmail to Signal, you will be emailed mutual connections if there are any.
If you don’t have any mutual connections, you might be able to find them on the VC’s website. Typically investor emails are their first name @ domain of their firm website.