How to configure customer's area

[Yosu]

How do you edit or configure the customer area?

Talking about what's found here: (domain name edited):

https://my.domain.com/manimg/showroom/1/index.html

[lexsusdk]

have often thought about it, if you change something, it always returns to default

[ksenya]

You can try adding your custom CSS to the Branding settings in BILLmanager