Install directly or follow these steps:
Open the Todoist app on web or desktop.
Click your avatar in the top-left corner.
Select Settings.
Click the Integrations tab.
At the top, select Browse.
In the list of available integrations, select TaskToProject.
Click Add.
Click Confirm.
Note: When you run the extension for the first time, you will be asked to grant access to read and write application data.