The bad news is....You don't. The Wouxun HT's don't have a VFO, so you're limited to whatever frequencies are programmed into them. Study your manual, and practice the basic menu operations to become familiar with them.
The programming software is also a HUGE help, but it's to your advantage to know how to perform the basics unless you have a laptop to drag around with you to change the memories.
If this is your first HT, you would have been better off spending the extra money and getting something like a Yaesu FT-60.