the classis timing

i use the soft is quartus10.0 , and the time is classis timing analysis . EP3C5

1 :

then i have find the ploblem ,it is that

when the pin is used for input , then i use the chip planner and find this pin ,then cllck the pin ,and the resource property editor is appeared , the question is this :

1) : i found the "input pin to logic arry delay 0" is used ,and the value is 6 ,

then i change the value ,but the value is no changd ,

can you tell me why it is ?

2) : can you tell me how to use the "input pin to logic arry delay 1" , because i found the "input pin to logic arry delay 1" is graaly .

3): what is it different form the "input pin to logic arry delay 0" to "input pin to logic arry delay 1" ;

2 : when the pin is used for output , and i click the chip planner and the resource property editor , then i found the output property "output pin delay " and the "output enable register tco delay" is gray .

so i have a question is

1):how to set in assignment ,then the outputpin can use the "output pin delay " or the "output enable register tco delay"

3: in assignment property , i find the setting "input delay from pin to internal cells " and "input delay from pin to input register" , can you tell the different form input delay from pin to internal cells " to "input delay from pin to input register" .

thankyou