1) Create a gallery
2) Upload images to the gallery
3) Right click on the image to copy image address
4) Embed the image in your body based on Markdown code (Chapter Images)

Example 50%

<img src="https://s3.amazonaws.com/brainstore-d2014/website/node/base/cover_images/000/000/368/cover/0107.jpg?2018" alt="Titel" width= 50%>

Example 100%

<img src="https://s3.amazonaws.com/brainstore-d2014/website/node/base/cover_images/000/000/368/cover/0107.jpg?2018" alt="Titel" width= 100%>

Example 25%

<img src="https://s3.amazonaws.com/brainstore-d2014/website/node/base/cover_images/000/000/368/cover/0107.jpg?2018" alt="Titel" width= 25%>