First of all, thank you for your help.

I tried nano /etc/init.d/mountswap.sh
and I get /bin/sh: nano: not found
Something is missing here.
I need to download something?

Please note: I don't know much on this; I am following your directions kind of blind (trusting you of course)

In time: I search a bit and I found that nano is a file editor.
Apparently, I don't have it in my N810.
I found the repository "Maemo diablo/tools and I found nano(v.2.0.2-1osso6) in the package list.
I added the repository to my installable applications.
However, it is not showing in the list to install it.
I will keep trying.
Anytrhing could help please tell me.

Still in time: I found the file in http://nitapps.com/
I downloaded it and installed.
Everything works great.
Just one difference: After you do Cntl O to save, to confirm is not Yes, it is Enter.

Thanks a lot Shaq!!! I learnt a lot today.

Just 1 question: I really edited the swapon file or I created like a "batch" file to be run at start up?

Thank you!!!