Hello How can I delete someone with who I shared my activation code?
Presumable you have a multi user version of avast.
If so you should be able to open your Avast Account from the User Interface (right click the Avast Tray icon) - Registration Information - Go To Account. There you should be able to see all the activations of your multi license product.
This may also help, whilst not appearing to be directly related. But should help as that would be done in the same way.
- Transferring an Avast subscription to another device
- https://support.avast.com/article/transfer-subscription/#pc.