Add goals by dragging them from the “Lifegoals” list on the right of the screen to “Your Timeline”. You can select when you want the goal to start by placing it on different spots on the timeline. If you want it to start in the short term, place it on the left side of the timeline closer to where it says “My Profile”. If you want your goal to start in the longer term, place it on the right side of the timeline.
You can determine the exact start time for the goal by observing the grey bubble that appears with the years from now / year of that point in Your Timeline.