Steel Design is not considering the input design parameters

I am changing the K and FYLD parameters for some members but the values reported in the design output indicate that those did not change. Why ?

For the values to be accepted by the software, you need to ensure that these parameters are added to the input file before the CHECK CODE or SELECT command. For example if you need to specify FYLD as 50 ksi for members 1 and 2, you should have the commands in the following order

PARAMETER 1
CODE ...
...
FYLD 50 MEMB 1 2 
CHECK CODE ALL

If you add the parameters after the CHECK CODE as shown next, the design would not consider those

PARAMETER 1
CODE ...
...
CHECK CODE ALL
FYLD 50 MEMB 1 2 
...