I can’t find a way to change address, phone number etc. in the contact section. I can change only the title of the sections (address, customer support). See the attached screenshot for a better understanding of what I mean.
I wanted to add that clicking on the pencil icons doesn’t do anything.
I found the answer on my own: you need to click on Details and then you can edit those fields and the links of the social icons. I wonder if you can remove some of those icons if you don’t use a platform, e.g. Twitter.
You need to leave the link empty, without #. Then the respective icon disappears.
Hey there
nice to hear you found a solution 
Regards
