1- Access the blog. If it belongs to the portal, use the Tools option in the menu on the left hand side of the portal's main page. If it belongs to a group, go to Groups Area > Group > Contents > Group blog. If it is your personal blog, go to Personal zone > Own contents > Blog.
2- Click on the title of the item.
3- Go to Attached files.
4- Click on Browse to find the file on your computer that you want to upload.
5- Search the directories on you computer to find the file.
6- Give the file a name (optional).
7- Click on Send to publish the selected file.