Did you meant to say vfo a and vfo b?
In chirp click SETTINGS on the left then click/select WORK MODE SETTINGS and you'll see vfo a frequency and vfo b frequency entry fields.
Enter your frequencies such as 147.000 don't forget the decimal point when using CHIRP.
Also it is just as simple to enter vfo a and vfo b from the keypad.
If the radio is in Memory mode turn the radio off, hold in Menu and turn the radio on until you hear a double Beep.
PRESS MENU then press the 7 they then press MENU again until a down arrow is on the lower display next press either the up or down arrow key on the keypad to turn TDR off then press EXIT/AB.
Press EXIT/AB to select the upper line of the display to enter a frequency for VFO A, you'll see a Up arrow adjacent to the LCD frequency display or press EXIT/AB a second time to get to the lower display/vfo b, you'll see the down arrow displayed on the lcd next to vfo b frequency.
Enter the desired frequency using the keypad, for example 147000, the decimal will already be filled in for you.