Use the URL from the browser.
DO NOT use the "share" tools they provide.
Format like this:
https://www.youtube.com/watch?v= <-- that, exactly that do not deviate.
That is the basics. Then there will be a 'random' looking code, which is the actual video URL for youtube.
snBcA-AqVGk <--- a video code.
Then together like this:
https://www.youtube.com/watch?v=snBcA-AqVGk
And paste it in the box that pops up when you press the youtube button.
ANYTHING ELSE will mess it up. Short URL = fucked. Time stamp to start = fucked.
&t=34s.
You can get away with just grabbing the code and using the BBCode, IF you are in BBcode view first.
'Back To The 80's' | Cassetter Edition | Best of Synthwave And Retro Electro Music Mix
That looks like this:
[ youtube ]YOURVIDEOCODE[ /youtube ]
Take out the spaces near the brackets and it should work then too. Arfcom adds the URL at the bottom so you can click to go there instead if you want. You cannot turn that off.
Unpaid accounts have permissions set to embed so it should be possible.
Difficulty, harder to do on a phone but still possible.