1.Open the .exe file you extracted
2. Search in your pc a folder called "Grim" should be located in /Users/App Data/ Roaming/ Grim  but its better if you just search Grim in archive explorer
3. Open a new txt file and type :
"addnode=45.32.195.56:24861
addnode=reaper.rocks:24861"
4. Save file as "grim" and change its extension from .txt to .conf so its called  "grim.conf" (be sure to select "all" types instead of "text" also)
5. Close and restart your wallet
6. Wait for it to Sync