How to add footer with own HTML code?

I would like to add in footer some tracking code from Google Analytics or Piwik stats but I can’t find any place in control panel, files or database where I can put this :confused:

Hi @Aka4Code,

While this isn’t currently supported you’re welcome to nominate this as a feature idea to be upvoted.

Nominated:

Place to enter Google Analytics or Piwik stats tracking code