How to cancel the curriculum I have already selected from the plan

There are two options:
- select another topic from the plan simply by clicking on it
- if you don't want to select a different topic from your plan, but want to write the topic manually instead, follow these steps:
 
Click a topic from the plan you want to cancel.

A window with an overview of recently taught lessons and the plan opens. In the lesson view, click the "x" sign next to the topic.

How can I write text to the topic selected from a plan?