You will have to upload the file to the college Dropbox site, and then post to the blog - the title of the post is the category of the download (Newsletters, Information leaflets, etc.), the contents of the blog post should be a hyperlink to the file you have uploaded, and the post should be tagged 'Downloads'. As with all posts, it may be worth checking the SWBC site after updating the blog to check that the link works and has been put in the right place.