The poem probably translates to something like:
Announce that I have reincarnated, soon I shall become like the Green Emperor(constellation/mountain/nature)
Green Emperor, or Bluegreen Emperor as the site I'm referencing likes to call him, also has this well known form most people who dabble in Chinese mythology know about: The Azure Dragon.
ctrl + f4 and type in Cangdi if you're interested in a small paragraph on Cangdi on the link below
https://www.wikiwand.com/en/Wufang_Shangdi
Edit:
Seeing that he calls himself the Azure Emperor in Chapter 2, perhaps it's just something like this:
Announce that I have reincarnated, I shall become the Azure Emperor once more!