How do I access the POI Jakarta?

Hi, I'm trying to write a program that needs to access excel

I've never worked with POI Jakarta before and I do not know how to import correctly

I downloaded poi-src3.8beta file and unzipped it and it spits out a folder.

what do i do with this?

I tried to import using statements
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFCell;

but none of them seem to work.

how do i address this issue?