Answer as follows: To activate the Lavida app, you need to follow these steps:
1. First, download and install the lavida app on your phone. You can search \"Public Lavida\" in the mobile app store to find and download the app.
2. After the installation is complete, open the application. You will see a login page.
3. If you already have a Public Lavida account, please enter your username and password and click the \"Sign In\" button.
4. If you do not have an account, please click the \"Register\" button to register your account. Follow the prompts to enter your personal information and create a new account.
5. After registration, you will receive an activation email. Open the email and click on the link to activate your account.
6. Return to the Lavida app and log in with the account you just registered.
7. After logging in successfully, you can start using the functions of the Lavida mobile app.
Please note that the specific activation steps may vary depending on the version of the Lavida mobile app and the developer's updates. If you encounter any problems during the activation process, it is recommended that you consult the official website of the Lavida mobile app or contact its customer service staff for help.