I don't know about mining directly the pow portion but you can go on https://www.cryptopia.co.nz/Exchange/?market=808_BTC buy some 808 and send it to your own wallet and stake it. After 8.08 days, you earn your phat 17.75% interest.

I would highly recommend avoiding poswallet.com because they're starting to act like mt gox. I think scammers are stealing people's 808coin to sell for themselves; prices are going nuts right now.

Edited: Decided to pop into their posw btctalk thread, seems like there aren't too many problems yet with poswallet but it's still throwing up red flags.