Here is how to add an file from your computer to a post (the maximum file size is 2MB):

1. start a new post
2. after entering your text, scroll down to the Upload Attachement (below the Submit button etc) and click on Browse across from the Filename field (first field in that section)
3. find the file on your computer and click Open (or OK depending on the browser, but select it one way or another)
4. add a comment on the file if you want and click on "Add the file"
5. a new window will open showing the progress of the upload but will close when completed (no action needed on this part)
6. once the file has been uploaded, click Submit (or preview first to double-check it)

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Ken