Ep64: how to sell Weenus via PPSwap

PPSwap is a token presale launchpad. One can sell Xeenus via PPSwap by
1) Make an offer on Xeenus and give allowance in the size of the balance of Xeenus to PPSwap
2) Give allowance in the size of the balance of Weth of the buyer to PPSwap
3) The seller accept the offer with the right amount of Weth.