How to assign seismic load in

dear honorable engineers,

I am learning on my self.please someone write to me how can I assign seismic load(both static and dynamic) in especially through is1893.Please tell me about seismic defination. When we assign self weight, joint weight,member wt,floor wt in seismic defination, shall we again assign them in Load Case Details?or What is actual meaning?

thanks in advance