Can anyone tell me in detail how to do simulation for this exercise 6

A fixed rectangular frame ABCD with dimensions: L = 360'' and h = 180'' is subjected to a horizontal force W = 10 lb

acting on joint C. Calculate the support reactions and moments.

should I create this model from the tool box? or there is a simplify way to solve this problem?

I created a 3D model from the tool box but I can not create the fix constrain on the based, and it only allows me to create constrain on the join only after i treated the model as beam.