How do I select pins in Quartus 2?
Use Assignments->Pin planner.
Once in there, click on New Node, write the Node Name (same as port on topmost entity/module), and in Location you select the chip's pin number.  You can also select the kind of driver (ttl, cmos, etc) in that same table, along with other pin related settings, such as pullups and driver strength (if output).

If you already synthesized the design, the table will be already populated, so you just need to edit it with the desired locations, buffer type, drive strengths, etc.