Each application has two predefined groups: Editor and Viewer. Like their name suggest, users in the Editor have both Read & Write rights, and users in the Viewer have only Read rights.
First to click on Right to access all groups for the application.
Accessing Rights
Setting up Editor Group
Click on Editor and head to the Permissions Tab and select "Read + Write" for both your To Do class and the TIVITY File class.
After setting the permissions, you must set yourself as a member of the Editor group. Head on to the Members Tab, click the plus icon ➕ and find your user.
You will also notice going to the Member Of Tab that Editor is a member of the Viewer group.
Editor Group Properties
Setting up Viewer Group
In the Rights window, click Viewer, head to the Permissions Tab and select Read for both your To Do class and the TIVITY File class.
As mentioned before you will notice that Editor is a member of the Viewer group in the Members Tab.