mysql-query-browser: how to select a DB ?

Hallo!
I'm trying to use mysql-query-browser.
With the traditional console utility I could address a specific
db saying:

mysql -u myuser -p -D myDB

I did not find any way to select "myDB" from mysql-query-browser.
it gives the possibility to select a 'schema' (but only information-
schema
is available).

How to select a specific db in mysql-query-browser:?
Difference between db and schema ?

Thanks to all
Roberto

I try to better specify my question:
although I can connect to my remote mysql-server
with mysql-query-browser I do not see any "schemata" or db (the same
thing I guess) in the
right panel (db browser).
I see only an object named "information_schema".

I am sure at least one db named "zm" is present
in the server: i can see it in /var/lib/mysql/zm
and can connect to it locally with:
mysql -D zm -u zm -p

What I am missing ?

TIA
Roberto