I guess you mean you want one animation to happen "automatically" and the others to happen when you click the mouse or press SPACE etc?
You need to go to the animation pane (Animation TAB > Animation Pane
You should see the animations listed.
As you select each one you should see Start : On Click (or With or After Previous) on the ribbon.
Change the second one to 'On Click' and maybe also the third depending on whether you need 2 and 3 to appear together.
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