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Go to: Settings → Personalization → Custom Instructions

Paste in the "What would you like ChatGPT to know?" field

Go to: Gems → Create a new Gem

Paste into the Gem's instructions field

Go to: Projects → Create Project → Instructions

Paste into the project's custom instructions

Go to: Cowork → Add context

Paste the skill as context for your cowork session

Go to: Settings → Custom Instructions

Paste in the custom instructions field