If you look in the Help secion, then you can find most answers!
Hope this answers your question.
StacyStac: When posting, look for the 'Attachments' button. Click on it, then the '+ Add Files' button. The click the 'Select Files' button.
Navigate to where your image/file is. Select it and then use the 'Upload Files' button. Click 'Done'. and you're done!
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