The steps of adding animation effect in PowerPoint are as follows:

1. Select the element to add animation effect.

2. In the menu bar, select the Animation tab.

3. Select the animation type and its effect in the Animation group.

4. Click the "Effect Options" button in the "Animation" group, and set the motion direction, initial playing mode and duration of the animation in the pop-up drop-down list.

5. In the animation pane on the right side of PowerPoint, check all the animation effects added for this strategy in the slide at that time, and make more settings for the animation effects.