create the full text index using phpMyAdmin or however you usually admin your database ... or run a query like:
ALTER TABLE myTable ADD FULLTEXT(title, description); (you would need sufficient privileges to do this)
and then your query would be something like this:
SELECT * FROM myTable WHERE MATCH(title,description) AGAINST('+keyword1 +keyword2' IN BOOLEAN MODE)
that's how i do it anyway.
you need to write some kind of function in order to add the '+' sign before each word.
note by default i think the index only indexes words of 3 letters or more, you can change this in the MySQL configuration file if you want to.