@carlo_N9:
I am sorry that I did not have time to answer you right away. Your question however was of a general nature and it was not related directly to CloudGPS, since you asked how to edit a file on N9.

I suspected that the community will be kind enough to provide you with an answer and it happened by xes and vi_ being so nice to give you hints about tools you can use to edit files.

I am not going to address the things that have been posted in your following posts in detail. I will only summarize it this way: the others behaved correctly and tried to help you while you rejected that and broke netiquette several times. Please refrain from that in future.

I will be able to help you more if you clear some things for me:
1. Which guide did you follow?
2. Why do you need to modify providers.ini and what changes do you want to put in it?
3. Are you able to modify files as root on your N9 yet? If not, what is the specific problem you are facing?