Pentium G3258 + ASrock B85M Pro4 Overclocking (I'm confused)

Hey guys so I was planning to overclock my CPU today, the Pentium G3258 in a ASrock B85M Pro4.
With the latest Bios Update (P2.40). and I am a noob at overclocking. But I can't seem to find any of the overclocking options for the multiplier, I can only find the voltage options.

So I'm not sure where to go from here, just looked around in the BIOS for quite a while, but that didn't go anywhere really.

Would anybody perhaps know where to find the multiplier option and/or have some tips?

And this is the OC guide i'm following:

Have you read the manual?

The mobo manual? Yes I have, but it doesn't say much about the BIOS, It's mainly about installing hardware.