How to change Power Steering Fluid in Reservoir on Chevrolet Suburban

20756710 ac delco power steering pump new for chevy avalanche suburban yukon 2007 sierra 1500 classic slt al whl(n93), alum whl(qs8), includes reservoir. 2007 Sierra 1500 Classic SLT ENHANCED TOWING PERF PKG(NHT), CHROME WHL(PY9), ALUM WHL(P25), ALUM WHL(P27), INCLUDES RESERVOIR.