You might learn to read a bit closer:
“sending his angel to his servant John”
1 The revelation of Jesus Christ, which God gave him to show his servants[a] what must soon take place; he made[b] it known by sending his angel to his servant[c] John, 2 who testified to the word of God and to the testimony of Jesus Christ, even to all that he saw.
You might want to read a bit further on.
10 I was in the Spirit on the Lord’s day, and I heard behind me a loud voice like a trumpet 11 saying, “Write what you see in a book and send it to the seven churches, to Ephesus and to Smyrna and to Pergamum and to Thyatira and to Sardis and to Philadelphia and to Laodicea.”
12 Then I turned to see the voice that was speaking to me, and on turning I saw seven golden lampstands, 13 and in the midst of the lampstands one like a son of man, clothed with a long robe and with a golden sash around his chest. 14 The hairs of his head were white, like white wool, like snow. His eyes were like a flame of fire, 15 his feet were like burnished bronze, refined in a furnace, and his voice was like the roar of many waters. 16 In his right hand he held seven stars, from his mouth came a sharp two-edged sword, and his face was like the sun shining in full strength.
17 When I saw him, I fell at his feet as though dead. But he laid his right hand on me, saying, “Fear not, I am the first and the last, 18 and the living one. I died, and behold I am alive forevermore, and I have the keys of Death and Hades.”
Yep, it’s Jesus speaking who ordered John to write, unless you think that some angel did all that.