Here's how to do it: trade PayPal for some other form of value and then trade that easily with a trusted member on he forum.
Absolutely never do it directly. PayPal is reversible, so everyone will think you're a scammer and charge huge fees.
It's also against PayPal's ToS now, I think.
That is correct.
Currency exchange is prohibited, it's clearly stated in their ToS.
OP is newbie and asking how to buy bitcoins with paypal. Does it sound familiar?