Copy .env.example
to .env
cp .env.example .env
Login discord with web browser
Open Developer tool (F11 / F22 / Use Inspect Element)
Select the fetch/xhr filter then select one of the urls and look at the headers to see the discord authorization. Then copy and fill in the .env file
Go to one of the channels on the discord server and copy the link to one of the messages.
For example as below
https://discord.com/channels/885705689350144010/971373217002438737/1236861681200664637
The channel id is 971373217002438737
and paste in the program.