Hello Kanto,
I would suggest you to follow java + testng + selenium video tutorials first before working with STF
http://www.seleniumtests.com/p/free-selenium-training.htmlThese videos also cover maven. And then you would know how you can use testng or maven to drive test using STF.
To answer your question. You should be in the same directory where pom.xml file is located and then you should execute following command -
mvn test
but I said, you should first follow following training videos -
http://www.seleniumtests.com/p/free-selenium-training.htmlHope this helps.
~ seleniumtests.com