To use your own logo, the simplest thing is to name it "logo.gif" and upload it to the "images" directory under your Advokit installation's web root - replacing the original "logo.gif". You can use a different file name and/or location, or not use a logo at all by editing the "logo_url" variable in advokit.ini. Here is the documentation for that. (Not using a logo might be desirable if you intend to use a css background-image - see the next section).
; Enter a url here to use for the logo image (relative url is from
; web root of application, exclude the leading slash). If left blank then
; the default AdvoKit logo will be used. If "none" is entered, no logo will
; appear. Examples:
; logo_url = ""
; logo_url = "images/logo.gif"
; logo_url = "http://www.a_domain.com/advokit/images/logo.gif"
; logo_url = "none"
logo_url = ""