ssh to your server with a user that can sudo up, and have your details ready, and change to the directory where the .sql dump is located. Of course, maybe make a new database in the mysql server, so you don’t accidentally override anything.
mysql -u dbusername -p dbname < file.sql
The dbusername is the mysql username that has permissions to use the database.
The dbname is the mysql database that is available for that user to connect to, once the password is provided.
The file.sql is the database filename that you wish to import
The -p should not be populated, it will prompt you to enter the password.