How does one communicate with entities? / WWY Q&A 63

WWY teaches on spiritual warfare BUT until now I haven't explained in greater detail how is that done. How does one actually communicate with the various entities?

But I would be remiss if I didn't teach you some fundamentals along the way to keep you from getting frustrated as well as things to look for - as I encourage you to also trying your hand at ministering to others. Since we are in a spiritual war it would be good for you to learn the fundamentals.

Mat 9:37 Then he said to his disciples, “The harvest is plentiful, but the laborers are few; 38 therefore pray earnestly to the Lord of the harvest to send out laborers into his harvest.”