Use iTunes to install: Connect the Apple phone to the computer, then open iTunes, select your phone model in iTunes, click "App Store", search and find the IPA software you want to install, and click the "Install" button.
Use the jog key or 3uTools to install: first connect the Apple mobile phone to the computer, and then use the jog key or 3uTools to import IPA files. If the IPA file has been signed, you can click Install directly; If it is not signed, you need to choose a valid certificate to sign before installation.