Last update: August 12, 2020
You need to jailbreak your iDevice first to follow this tutorial.
You will need ReProvision to sign your jailbreak app. ReProvision is a free jailbreak tool to sign .IPA files. It doesn't require a developer account, and to run it you need an Apple ID and password to sign IPAs. Is not recommended to use your main Apple ID.
) to your sources, search for Reprovision and install it.
Download the IPA that you want to sign (in my case unc0ver), open the downloaded IPA, tap the "Share" Icon and tap on "Open on ReProvision".
Tap the "Install" button in ReProvision. Wait for the install to complete and enjoy!