The above command displays the URL to open in a web browser to do that. You may be asked to log in first.
Then, open the asciicast page and look for a dropdown with a gear icon. It’s below the player, on the right side.
Install ID is a random ID (UUID v4) generated locally when you run asciinema for the first time, and saved at
$HOME/.config/asciinema/install-id. It’s purpose is to connect local machine with uploaded recordings, so they can later be associated with asciinema.org account. This way we decouple uploading from account creation, allowing them to happen in any order.
A new install ID is generated on each machine and system user account you use asciinema on, so in order to keep all recordings under a single asciinema.org account you need to run
asciinema auth on all of those machines. If you followed the above steps and you still can’t see the gear dropdown then most likely you have used different local user accounts for recording and auth (i.e. you recorded in a VM or Docker container but you ran
asciinema auth on your host machine).