Itunes RSS Feed

I made a podcast

https://s3.ca-central-1.amazonaws.com/montrealpodcast000/VOR12.5.2017.mp3

Uploaded an image

https://s3.ca-central-1.amazonaws.com/montrealimage/Montreal.jpg

Generated an RSS Feed

Montreal Podcast

The feed passed in Cast Feed Validator but won't work in itunes. I got a message asking for "Explicit" and "Category" which I added thusly...

<itunes:explicit>YES</itunes:explicit>

<itunes:categorytext="Humour">

</itunes:category>

between

</image>

and

<item>

Now it won't validate and Apple still doesn't like it.

Very frustrating and as I know nothing about computers and coding I thought I'd post here.

Everything I've done so far I've just figured it out as I go - don't let my use of technical terms trick you into thinking I know what I'm talking about.

Please explain in plaiin English as if you were speaking to an imbecile. Ahem:)

Any help would be appreciated.