Adding posts in New York is the same as adding posts on any other theme. However,New York does include post formats and a few additional fields for adding galleries, videos, etc.
The theme includes support for a few WordPress Post formats. So when you add a new blog post you can select a specific post format depending on the type of post you are adding.
All the posts also come with some handy post settings that are useful for the various post formats (adding video/audio links) or for changing your layouts (for example if you want a blog post to be full-width).
Using the “Gallery” post format you can add a slider to any blog post with ease. Simply select the post format and then use the “Image Gallery” metabox to add your images. Simply click on “Add/Edit Images” and select the images from your media library then click the button on the bottom left to add them to the gallery. You can hold down “command” on a Mac or “control” on Windows to select multiple items. Once added to the Gallery save your post! You can always click on any item in the gallery to drag/drop it to re-order the image as well as hover over it and click the “x” to remove it from the gallery. Have fun!