Where or how can I find the Spam folder on my I-Pad 2. I'm starting to get ALOT OF spam junk mail

Depending on your email provider - mine is Yahoo and I NEVER see ANY junk get past its filter - you can manage it at their WebMail page.

If it gets by your provider > iCloud: Manage junk mail

An article on how iCloud does it job > iCloud: Identifying and filtering junk mail - Apple Support

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There is no spam folder. if you get spam move it into junk and mail from the same address will follow it.