Try copying the
\InfoCenter folder and
eq2ui_custom_infocenter.xml into DarqUI_v3, then add these lines to eq2ui_custom.xml (which is already in DarqUI_v3):
<include>InfoCenter/includes.xml</include>
<include>eq2ui_custom_infocenter.xml</include>
The command for a hotkey or iconbar button:
/show_window Custom.InfoCenter
.