1. Copy opera.ini to the "Documents" directory (which is visible from the file manager). If you give the copy a .txt extension, you'll be able to open and edit it in Notes:

(Cut and paste this command in xterm after you become root)

cp ./.opera/opera.ini ./MyDocs/.documents/operaini.txt

2. When you've made the changes you want, make sure that Opera is closed and copy the results back:

(Cut and paste this command in xterm after you become root)

cp -f ./MyDocs/.documents/operaini.txt ./.opera/opera.ini


Note: Shamelessly ripped from part of artkavanagh's post.