If you wish to add an image into the body of a page this is done in the Page Content section when editing a page.
You will see the Page Content section, once you locate where you want the image to be, click the Insert/Edit Image button;
You will see the following pop up:
If you have not previously copied the image URL, you can click the 'Browse' button to search your uploaded images
Once you have selected the image you wish to add, select 'OK'
Image will now appear in the Page Content section.
Make sure you save the page by selecting one of the save options at the bottom: