Assuming you already have the Trust Wallet app downloaded and installed on your phone, open the app and select the "Sign in" option. On the sign in screen, enter your registered email address and password. Once you've entered your credentials, tap the "Login" button to access your account. If you don't have a Trust Wallet account yet, you can create one by tapping the "Create new account" button on the sign in screen. Enter your email address, choose a password, and agree to the terms and conditions. Once you've created your account, you can login and start using Trust Wallet to manage your cryptocurrencies.