The steps of the icloud perpetual extension tutorial are as follows:

1. Click Manage Storage Space to enter the iCloud page of Apple's mobile phone, and open the Manage Storage Space icon to enter a new interface.

2. Click Change Storage Space Scheme in iCloud storage space interface to open the function window of Change Storage Space Scheme.

3. Select the scheme point to be upgraded and set the expansion size, and then choose to upgrade to iCloud+ scheme.