System Advisor Module Software - Help Required

Need help with System Advisor Module Software (SAM Software) I am doing a simulation for 1 power plant. This simulation will be done twice one with a normal receiver ( pipe) & the other with the same receiver but we will decrease the length. Then run those to see things cost wise. It’s a CSP power plant simulation Shams. For now I have the values of the lengths, but I don’t know where to input it. L=2.09 & L=1.46 The field sizes need to be according to Shams power plant abu dhabi. If you think you can help me out with this, please get back to me. Thanks.