To turn on Assembler support for a CICS-enabled enterprise server: 
               	 
            
 
            	 
             
               		
               - On the Enterprise Servers Administration page, click 
                  		  Edit in the row for the server for which you want to enable Assembler support. 
                  		
               
  
               		
               - Select the 
                  		  General tab and type the following in the 
                  		  Configuration Information section: 
                  		  
[ES-Environment]
ES_MFASM_SUPPORT=Y
 
                  		  
               		
               - Click 
                  		  Apply and then 
                  		  OK.