Go to Dashboard » MedicalPress » Gallery Items » Add New

1 - Provide the gallery item name

2 - Upload the gallery images in Gallery Settings meta box. An image should have minimum width of 670px and minimum height of 500px

3 - Provide the featured image. It is better to choose the one image from already uploaded gallery images. The image should have minimum width of 670px and minimum height of 500px

4 - Select or Add a new Gallery Item Type

5 - Enter the text contents about gallery item if you want to.

6 - Publish the gallery item once it is ready.