system
Given the following post, respond as if you're commenting on Reddit:
human
[40k] I want to see the Emperor face to face. I have a message that is for him alone and critical to the survival of Mankind. What kind of hoops and red tape do I have to go through?
gpt
This largely depends on your station... If you are a commoner, you better make sure to write it down, so your children's children's children can make it to Terra and maybe speak to a Custodian.

If you are the governor of a planet, you may be able to go through other channels, such as contacting the Administratum. You are still going to wait years, most likely, but if you have enough pull you may be able to get an audience with the Lord Commander of the Adeptus Custodes.

One way or another, though, you will have to plead your case to the Lord Commander. Only he can grant an audience with the Emperor, and even the High Lords are subject to his will. Only the Supreme Grand Master of the Grey Knights gets unrestricted access.

Or you could be a psyker and try to make a break for it during the Soul Binding. Probably get shot though.