-Log-in to your Hotmail account. ...
-Click "Attach" on the bar above the message (it's right next to "Send"). ...
-Click "Browse" to find the photo(s) you want to attach. ...
Select "Browse" again to upload another photo, if desired. ...
-Click the "X" in the corner of the attachment to delete photos, if necessary.
(this practise is similar across all email platforms)
Usually there is a paper clip... this will stand for "attach" then simply select the photo. Save the photo somewhere you will be able to find it :)