To log in to Power BI, you typically follow these steps:

1. Go to the Power BI website.

2. Click on the “Sign in” button located in the top right corner of the page.

3. You will be redirected to the Microsoft login page. Enter your Microsoft account credentials (email and password) associated with your Power BI account.

4. After successful authentication, you will be logged in to Power BI, and you can start using its features and functionalities.

Please make sure you have a valid Microsoft account or a work/school account if you are using the Power BI Pro or Power BI Premium features. If you don’t have an account, you may need to sign up for one before being able to log in.

Keep in mind that the login process might change slightly over time, so it’s always a good idea to check the official Microsoft Power BI documentation for the most up-to-date instructions.