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Why does your link say minnowbooster.com while the blog post says minnowbooster.net/delegate? Also the instructions said it would ask for the private key. Why do i need to enter my wif?

I used delegation market https://www.minnowbooster.net/market
active key wif is needed for lending funds.

is it different from the link in this post?

Yes, you can delegate to @minnowbooster bot and get returns based on its revenue, or delegate on delegation market to other steemians and get fixed 18% apr.

got it. Thank you!

And what does mean 10% fees? So if i send 100sp, they grab 10 sp fee and give 90sp+ 18% ?