Like many things, it's easy once you've done it once, and a damn sight easier than what your achieving with your car!!
As you suggest, uploading to this site instead of other cloud storage like Photobucket will be fine, though your message will then include a section for attachments and the viewer will have to click on the to see the picture - it won't be embedded in the text. There's nothing wrong with that though so give it a go.
Once that's successful, upload the photo to here in the way you've learnt then whilst in 'manage attachments' click on the image which will open it in a new tab, select the web site address at he top of your screen (the URL) then use the method I mentioned above to embed the image (using '[img] URL here [/img]
Have fun!
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