Step-By-Step Guide:

1. Ensure you are in Edit Mode
   
   

2. Find where you want to insert your new item, then select the checkbox next to it
    

3. Select Edit > Add New Item in the administrator toolbar
   
   
4. Choose whether you want your new text to be inserted above or below
   
   
5. Select the Text content item
   
   

6. Type or paste into the box provided, then save changes

   
   

Video Guide:

Click to see larger size