Syntax is Formula FieldName. No spaces in formulas in the Custom Field section.
Available Visiting team Fields: visAB,visH,vis2B,vis3B,visHR,visRBI,visSH,visSF,visHBP,visBB,visIBB,visSO,visSB,visCS,visGDP,visCI,visPitchers,visLOB,visER,visWP,visBK
Available Home Team Fields: homeAB,homeH,home2B,home3B,homeHR,homeRBI,homeSH,homeSF,homeHBP,homeBB,homeIBB,homeSO,homeSB,homeCS,homeGDP,homeCI,homePitchers,homeLOB,homeER,homeWP,homeBK