Conference calling with PPC-6700

[Nikkirox_1]

I was just in a call and today was the first time since buying this phone (I bought it a few weeks ago) that I needed to use conference calling. I couldn't figure it out. So I opened up my user guide that came with the phone and it gave instructions on how to do it. But guess what? According to the handbook you should be able to put the current call on hold and make the next call. Here is the thing. When I am not in a call I see the hold button (it is grayed out) but when I am in a call the hold button is not there. Anyone know how to make the hold button appear while in a call and be an active button too? Please.