You make contact with him energetically, for a bond to be created and strenghten, there need to be a start
Meditating on Satan, is meditating on his energy, and when we evolve we are able to feel more and more clear his energy, which give us a feeling of pozitivity,relaxation,pleasure,understanding,and so on.
Is basically a first step in knowing him , when you do that you can also speak to him, even if your astral hearing is not enough powerful to hear him back, he will always hear you(if you focus on his sign) telling him about what you consider you will like to tell to your creator and your Father.
Also, be very respectfully while doing it and be honest, no need for lies to "seem better than you are" he sees through your entier existence if he wants to, no point in lying, be yourself cause he accept us as we are, but also evolve and become a better version of yourself.
And about protection, while we evolve he expect us to protect ourselves more and more , because we can.