How To Add Objectives In Game?

I want to make like this

Objectives

I want to make GUI text appear about 5 seconds before do the objectives and then dissapear

  1. Find a machine, pull lever/push button
  2. Find way out/Escape

Do you guys have any idea how to make it?
I know this include a trigger but … my problem is I want player go find a machine FIRST before you escape …

Thanks in advance

this can be done using coroutines,which will pause a function execution for a frame cycle or few sec that you specify.
Display the first objective for few sec using coroutine technique then make a trigger on completion of objective and display the second objective using the same.