Hi,
There is no obligation to use MySQL to install WordPress. You can, without any problem, use MariaDB which is the default database manager with full installations of Wampserver 3.2.0.
If you didn't specify anything in particular, the database you created with PhpMyAdmin was created with MariaDB, so you don't have to specify a port.
If you absolutely want to use MySQL, make it the default database manager:
Right-Click -> Tools -> Invert default DBMS MariaDB <-> MySQL
But, after that, you'll have to recreate your database with PhpMyAdmin
For further explanations, read Right-Click -> Help -> MySQL - MariaDB
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