Child themes for websites already running

Hello,

I have websites already running. Some of them are up and running in Internet since many years ago already and sadly enough,I didn′t know about child themes.

While I have watched some tutorials what I still don′t get clear is what I need to mark in order to fully replicate the website once the child themeis activated. Forexample, I don′t know if I have to mark every issue under “Archivos” Tab where you can mark 404, header, footer, etc.

If there is any tab that i need to mark, I would so much appreciate your advice as I don′t fully understand what will happen to the plugins that are installed, for example.

My special concern is about membership plugin that is running in aflorarte.com/bibliolab . Also every configuration concerning payments.

KIndly let me know how to configure Child-Theme-Configurator in my case wthout loosing stye, content and current functions that are active in my websites.

Thank you very much and regards

Liliana

The page I need help with: [log in to see the link]