1. Basic configuration
2. APP icon configuration
1. Click to browse and select the icon (note: the image format is png)
2. Click to automatically generate all icons and replace them
3. Click Release and select Cloud Packaging
4. Go to the Developer Center to obtain the certificate
I have already obtained it here. If you have not obtained it, just follow the prompts to obtain it. It is very simple.
1. Click on the certificate details to 
obtain the certificate alias information
2. Click to download the certificate to obtain the certificate file
3. In the certificate details, click View Certificate Password to view the certificate password.
After filling in this information, you can package it. The way to create a certificate through jre is a little more complicated than this. I will summarize it for you later...