Outboard Motor Prop Guard How Do I Change The Prop Shaft For My 1978 Evinrude 140 HP Outboard Motor?

How do i change the prop shaft for my 1978 Evinrude 140 HP outboard motor? - outboard motor prop guard

The engine drive shaft broke the previous owner, but I have a new future. I do not know if anyone can give me some instuction, I need to access the backup engine, instruments, policies seal? Everything would be much appriciated! Thanks