Using Adobe Premiere Pro (PR) for special effects processing can add amazing visual effects to the video. Here are some basic steps to use special effects in public relations:

1. Import material: Start PR and create a new project, and then import the video material to add special effects.

2. Add the material to the timeline: select the video material to add special effects in the project resource panel of PR and drag it to the track on the timeline.

3. Select special effects: In the special effects panel of PR, you can find various special effects and transitional effects. Browse the Effects panel and select special effects to apply, such as color correction, blur, motion effect, etc.

4. Apply special effects: after selecting the video material to add special effects, find the corresponding special effects in the Effects panel and drag them to the video clips on the timeline. You can also adjust various parameters of special effects in the effect control panel to meet your needs.

5. Further adjust the special effects: Using the control points or key frames provided by PR, you can adjust the special effects more finely. Using keyframes, you can set the start point, end point and middle point of special effects on the time axis to create special effects that gradually appear or disappear.

6. Preview and export: Preview the special effects you added in PR to ensure that they meet your requirements. When finished, select the export option to export your video.

Please note that PR is a powerful video editing tool, and special effects processing takes time and experience to master. You can further explore more advanced special effects techniques by watching online tutorials, referring to PR documents or attending training courses.