This is a simple way to upload images and display them in your post. Add your text first and update your post to save it. Then, add your images one at time underneath your text, and make sure there is a clear blank line between your text and image, and between all subsequent images. If your images are smaller than about 500 pixels, then in the ‘Alignment’ dropdown (bottom right corner in the picture above) select ‘Center’. This way you should get your text and images nicely spaced.
Read more in the step-by-step guide: How to set up an OCA Learning Log on WordPress (pdf)