how do you activate apple care that came with cosco

Do you mean the regular mfr's warranty (1 year) or did you buy the separate Applecare + that costs money?

If you mean Applecare +, the coverage should be added to your device automatically if Costco is an authorized reseller. Check you coverage here to see if it's already added. If not, contact Apple support and ask to be transferred to the applecare division.

https://checkcoverage.apple.com/ca/en/;jsessionid=node0zd582r3pvr277r001m64yolz2396938.node0.

You should receive an emailed Proof of Coverage containing an Agreement Number and description of the covered equipment including its serial number.

If you did not, you can confirm your equipment coverage here: https://checkcoverage.apple.com/

Provide your equipment serial number: How to find your serial number

nanamaria Said:

"how do you activate apple care that came with my purchase at cosco"

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Verify AppleCare is Used:

Do they have their own coverage? I would ask Costco if AppleCare is what was purchased. Some seller have their own protection.