How and where can i run queries? what are they?

for instance:

ALTER TABLE `user` ADD `ipmask` VARCHAR(255) NOT NULL;
INSERT INTO phrase (languageid, varname, text, phrasetypeid) VALUES(0, 'ipmasks', 'IP Mask (xx.xx.* | xx.* etc)', 1);

you can run queries from within admincp (assuming config file grant your user with permissiosn for it).
location: under admincp -> Maintenance -> Execute SQL Query
Note that via there you can only execute 1 row at a time.

other, preffered way (if u ask me), is via phpMyAdmin.
just go into some table view, and you'll notice "SQL" tab on top.
you write your query there.

as for the question - "what are they?", quick answer:
those are ways of fetching information from mysql database.
those queries can be either fetch direct info (SELECT), change info (UPDATE), change table structure (ALTER) & more.
check google on mysql syntax, and i also think i've pasted here (no so long ago) some tut with resources on issue (or it was reqply to someone question - don't recall exactly).

hope this helps.
enjoy.

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