In order to add a new task, click the green plus icon, select "New task" and input the name of the task in the Title field.
If the project is virtual, select the "Add task" option and search for the name or ID of the task you would like to add. You can also add a task directly to a virtual project by ways of the component for Virtual project.
In order to add a checklist, click the green plus icon, select "Apply checklist" and search for the name of the checklist you would like to apply.