From the Admin Dashboard, click on the Lessons tab on the left hand side and then on the Lesson Plans sub-header. Click on the Lesson plan line item or on the three dots to the right of the plan and then click "View".

Click into any field to add or remove additional text. Click the three dots in the top right corner of a Lesson activity in order to remove it. Make sure to click "Save" in the top right corner of the screen once you've completed making edits.