To add MySQL database in Plesk control panel, please follow these steps:

Step 1: Log in to your Plesk control panel using your username and password.

Step 2: Navigate to "Databases" tab or icon and click on it.

Step 3: To create a new MySQL database, click on the "Add Database" or "Create Database" button. The specific wording may vary depending on the version of Plesk you are using.

Step 4: Provide the necessary details for the new database in the form that appears.

Enter the database name: Choose a unique name for the MySQL database.

Select the database server: If you have multiple database servers configured in Plesk, choose the appropriate server.

Specify the database user: You can either select an existing user or create a new one. If you choose to create a new user, enter a username and password for the database user.

Choose the database type: Select MySQL as the database type.

Additional settings: Depending on your Plesk version, you may have additional settings available, such as character set and collation. You can leave them as default or configure them according to your needs.

Step 5: Once you have filled in the necessary information, click on the "OK" or "Create" button to create the MySQL database. The new database will be created, and you will receive a confirmation message.

After creating the MySQL database, you can use it to store and manage data for your web applications or websites. You can also manage the database users, import/export data, and perform other database-related operations from the Databases section in Plesk.