How do I put in a new activation key

How do I put in a new activation key and where ?  Thanks

Oden, Please refrain from carrying out multiple postings on the same subject! You won't obtain an answer to your query any faster! Other posting (https://support.avg.com/answers?id=906b0000000DKaYAAW).
AVG Guru

Oden, Please refrain from carrying out multiple postings on the same subject! You won't obtain an answer to your query any faster! Other posting (https://support.avg.com/answers?id=906b0000000DKaYAAW).
AVG Guru