The small air vent (also called the end of the bar) and the rest are symbols in music, which are used to divide the beat and rhythm of music. They are used to give the player a pause time and can guide the player to keep a proper sense of rhythm in the music.

adding small vents to music courseware can be carried out through the following steps:

1. Open music courseware editing software, such as Microsoft PowerPoint and Keynote.

2. Find the place where you want to add the air vent in the courseware. Usually, the air vent will appear at the end of a bar in the score, so you need to determine the position of the bar.

3. insert the symbol of small air port. You can add an air vent by one of the following methods:

-Manual insertion: Find the function of inserting symbols in the courseware, and then select the rest symbol to insert. Rest symbols can usually be found in the symbol library. Choose the appropriate size and type of rest to insert into the corresponding position of the score.

-copy and paste: if you have a ready-made rest image available, you can insert it into the corresponding position in the courseware by copying and pasting.

4. adjust the size and position of the small air port. Make sure that the size and position of the air vent are suitable for the requirements of the score, so that it looks consistent with other notes and symbols.

5. Save and finish editing the music courseware.

It should be noted that the specific steps may be different due to different software and courseware editing methods. In the process of using specific software, you can refer to the help document or online tutorial of the software for more detailed instructions and operation methods.

I hope this answer can help you. If you have more questions, please feel free to ask.