As with its deployment, the Addin can be uninstalled directly from your O365 tenant.
Go to "Settings" --> "Integrated apps" --> "Add-ins".
Then click on the "Letsignit Add-in" add-in and on "Remove add-in".
To finish, click on "Remove".
If you have any questions about uninstalling the Addin, our customer support team is here to help you ;)
#addin #uninstalladdin #O365tenant