In post edit page, choose post format in the Format box on the right.
Enter information for the corresponding format options in BK Post format options box:
Post format video and audio: enter the url of the video or audio item. The theme support link from Youtube, Vimeo and Souncloud.
Post format image: click Select files button to select images or drag images in to image upload area to upload image to the post.
Post format gallery: click Select or Upload images button to add a gallerry to the post.
Gallery Format