RSS Validation Feed- Where/how to fix

I chose WordPress so that I wouldn’t have to create a feed. I don’t know how to code. According to Podcast Alley, my feed works, but “some users might have problems.”

Copied below are ALL the PROBLEMS with my feed, which I didn’t create, mind you, WordPress did it. And I can’t find this stuff ANYWHERE at WP to modify it.

BTW, iTunes shows the Artist as blank. Dunno why, I filled in all the relevent info at WP, at Feedburner, AND at iTunes. How could they NOT know who the artist is??

Are geek geniuses the ONLY ones allowed to podcast?!
Somebody should create a set of instructions for podcasters.

Please help.

Warnings :
WARNING Channel has missing or invalid itunes:owner tag. (code: 6610)
WARNING Channel has missing or invalid itunes:keywords tag. (code: 6580)
WARNING Channel has missing or invalid itunes:explicit tag. Assuming explicit=”yes”. (code: 6590)
WARNING Channel has missing or invalid itunes:subtitle tag. (code: 6600)
WARNING Channel has missing or invalid itunes:summary tag. (code: 6520)
WARNING Channel has missing or invalid itunes:category tag. Please use the itunes:category format rather than the older <category> tags format. (code: 6570)
WARNING Channel category blank after falling back to older <category> tag format. Assuming “General”. To change this, claim and edit your feed after submission. (code: 6020)
WARNING Channel has missing or invalid itunes:link tag after attempting fallback from failed itunes:image. Please use the itunes:image format and not the older itunes:link or <image> tags. (code: 6550)
WARNING Channel has missing or invalid image tag after attempting fallback from failed itunes:link formatted image. (code: 6130)
WARNING Item with missing or invalid opening and closing <itunes:author> tags (data: Item number 1 titled “[Show #02] Rochester NY: Mother’s Day Goodbyes (Part 2)”, Item number 2 titled “[Show #01] Rochester NY: Mother’s Day Goodbyes (Part 1)”, Item number 3 titled “RSP Thank You’s”, Item number 4 titled “Support the RSP”, Item number 5 titled “About the RSP”, Item number 6 titled “The Ryan States Podcast”) (code: 6500)