You can assign by default one or more members when creating a task, including the task creator.
In the relevant project, ans le projet concerné, click on the "Settings" icon in the top right corner of the window (below the user drop-down menu). You access the project settings. Go to the "Team authorizations" section.
Check the "Assign task creator by default" box and / or the "Assigned by default" box facing the desired member (s).
You can also add members directly to this section by typing the member's name in the "Search or create a member" field. If the member does not exist in your team, it will be automatically created and added to the list of project members.