Wake-up filter is a software based on image processing, which provides many filters that can enhance the effect of photos. If you want to use whitening function in the wake-up filter, you can follow the following steps:

1. Open the wake-up filtering software on your phone or computer.

2. Select the photo you want to edit and open it.

3. Find the "Beauty" option in the filter bar below, and click Enter.

4. You can find the whitening function in the beauty function, which can be adjusted according to your own needs. Generally speaking, adjusting the white to the right position can make the photos brighter and more shiny.

5. After the above operation, you can click the Save button to save the photo or share it directly on social media.

It should be noted that the wake-up filter software may provide different operation modes due to different versions, and the above is just a simple operation method. It is suggested that when using the software, you should first understand the specific operating instructions of the software.