1. download gminer - https://bitcointalk.org/index.php?topic=5034735.0

2. register at MWgrinpool. http://mwgrinpool.com

3. set up miner grin29.bat. use same username and password as used on MWGRINpool.
miner.exe --algo grin29 --server stratum.mwgrinpool.com --port 3333 --user USERNAME --pass PASSWORDHERE

4. ready to cash money? download payout script. https://api.mwgrinpool.com/v2/public/MWGP_payout.py

4.5 brew cask install python

5. Run the payout script
cd [PATH_OF_SCRIPT. THIS IS WHERE YOU DOWNLOADED THE FILE OR SAVED IT w/e]
python MWGP_payout.py

the script will now ask you for info
enter your MWgrinpool user and password when prompted.
enter your Grin Wallet password when prompted.

your payout will now be available in your grin wallet.