Once the offer has been detailed out, PASO will communicate this out and their transfer agent will provide instructions to brokers.
At that point your broker (probably the Corporate Actions Department) will be able to outline your choices and the specific mechanics for making each of them. All you will need to do then is tell the broker what your choice is and they will handle the mechanics for you.
Bottom line is that if you prefer to continue to hold common and don't want to tender some or all of your common shares to exchange them for the new convertible preferred you probably won't have to do anything at all. On the other hand, if you do want to exchange your common for the preferred, you probably will need to indicate this to your broker (generally this can be done over the phone).
Your broker will probably proactively communicate all of this to you since there is a choice involved. If they don't, get a better broker.