A "sign up attempt using your email detected" message usually means you already have a Venice account with that address, so the system blocked a duplicate sign-up. To get in, use the sign-in page instead of signing up: https://venice.ai/sign-in
Sign in with your email and password if you set one. If you do not have a password, or you are on a new device, enter your email and Venice will send a one-time verification code to enter on the website.