According to the following steps:
1. The official website who has prepared the certificate and explanatory documents and the all-around logo.
2. Use Safari to open the all-around sign.
3. Click to install the universal logo.
3. Import the certificate and description file (the password of the certificate bought at up is generally 123456).
4. Import the certificate description file and ipa package into the general label. The three files are the same.
5. Click on the ipa package.
6. When the ipa just signed and installed appears on the desktop, it can be used.