Modifying logo / look and feel of control panel

Hi, I need to urgently find a way of editing the control panel for content managers so that they see their company logo once logged in, and also change the default colours used etc. Which files do i need to edit to make these changes?

According to the wiki: "One method is to find the appropriate "welcome.html" file for the manager theme you’re using, somewhere in /manager/media/style/MODxLight/welcome.html. "

However, inside my theme (ModXCarbon) there is no we,lcome.html nor is there any other file that looks as if it contains the various items that can be modified.

????

The location has changed to /assets/templates/manager