The specific steps for Apple's mobile phone to set the background of WeChat friends circle are as follows:

1. Open WeChat, click the "Discover" interface and select the "Friends Circle" function at the top (as shown below):

2. Find the background of WeChat circle of friends above, and click the background position in the figure (as shown below):

3. Click the "change cover" function in the lower right corner (as shown below):

4. There are three ways to change the cover (background), choose from the mobile phone photo album (as shown in the figure below):

5. Select a picture (as shown below):

6. Adjust the image position, and then click Finish in the lower right corner to set it successfully (as shown below):