frame and joint salome

HI, i'm a civil engineering student and I'm working in my final thesis usig Caelinux and Salome.
I never used this sofware and I need your assistance.
I must to plan the structure and I don't know witch procedure I can follow in order to define the frame and to assign joint translation x,y,z , rotation about x,y,z and assign loads.
I know only the SAP software.
Plese me answer in this forum or in my personal address e-mail:
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Thanks:)