Here's the only way I know:

1) Draw your Fibs

2) Right click on chart and choose "Objects list"

3) Choose Fibs from the list and click the "Edit" button

4) Choose the "Fibo Levels" tab and you'll see all your levels. Simply click the "Add" button to input the new levels you want.

I don't know how to save it as a default setting, since Fibs are built into MT4, so you'll have to do it every time.

Unless someone else knows how to save your settings as defaults.

Terry