Reskin is a user premium feature, not a guild wide feature. This feature is not enabled by default and requires server admins to enable it.
Reskin is a feature which allows users to customise the bot’s avatar and name, this is done by utilising Discord Webhooks (messages are sent as Webhooks)

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Setting up Reskin in the guild

greed will create a webhook in every channel in the server, if you have enabled antinuke/antiraid in another bot, this might cause greed to get kicked/banned from the server.
,reskin setup
This will then allow premium users that are in your server to use the following commands: 
,reskin name (name)
,reskin avatar (image)
greed will then send the messages in webhooks, like this:

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Disabling reskin

,reskin disable

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Deleting reskin

,reskin delete