The maximum file size for pictures is 250 KB. The maximum number of attachments per post is 2. Please resize your file/image before uploading. A good free online photo editor to do this with is Pixlr.com. Use the 'Attachments' tab at the bottom of you post to upload your image. Click Add files and ta-da!
Alternatively, if you have your image elsewhere on the web, simply type the url (website address) of your image in your post to share.