MySQL (as any DB engine) was designed to interact with
applications.
Query Browser, however it's a
utility, and its purpose is to help you maintaining and doing administration stuff on the database. You don't do data entry from Query Browser, for that purpose you should either:
1-download an application that allows you to connect to MySQL and do data entry.
2-or develop an application that allows you to connect to MySQL and do data entry.
I don't think there are any free data entry software that you can download, but certainly it's very easy to develop in PHP following some tutorials.
-Mysql/php basics
-Using forms and databases
-Dynamic dropdown lists.