Yep, so at the bottom of that page is:
Serious Changes
You realise you need to change or add a helper function (e.g. the iconic navigation bar)
Follow steps 1-2 from "basic changes"then
create a sub folder called helpers
copy the helper file e.g. defaultviewnavtablebariconic.php to this folder
modify as required
Which explains it exactly :-)
Many thanks
Tony