[Test-Equipment] How can i change an HP 3466A to work with 220v?

[Perikooo]

Hello:

    I have a multimeter HP3466A that comes from USA and works at 110v. I
want to change it so it can work at 220v. On the back side it sais "See the
manual to change voltage". I have looked inside and there is 4 resistors
labeled HI, LO, 110v and 220v. The place for LO and 220v are empty. What
value of resistor i have to put there?

Thanks in advance