In your "Content" box, you will see a row of options that you can select from. At the end of your row, click on the "Add Media" button.
A box will appear, select "Choose File", browse for the image file you want to insert into your content and then select "Submit".
You will now see the image inserted into your content box.
To resize the image, just double click on the image and apply the width and height you prefer.
If you have any other questions or issues, please contact us at: firstname.lastname@example.org