If i don't understand how to meditation or what to do, can i pray to Satan and the anwser come in my mind? and pray can be however i said and finish with Hail Satan?

Its not hard to meditate you can just follow the instructions on joy of satan meditation page.

Follow it exactly and you will have results.

If you do not understand how to meditate, you don't pray to Sir Satan.

You first study and observe why you can't meditate.
Find the root cause.
Try to experiment new things and see what works for you to fix your issue.
You persist in the above as far as you can.

If the above doesn't work, only then do you pray for guidance. For any answers to come into your mind from any of the Gods, your clairaudience points should be worked upon and persistence in power meditations is required.

In my opinion, prayer should be filled with the most sincerest of desires, what you truly truly feel and want to convey. It should also be humble and respectful.

What do you not understand about meditations by the way ?