Can i use some attibute, like {FIRSTNAME}, with a non anonymous survey, INSIDE some question.
Something like a message
Hello {FIRSTNAME}
I did above, dont work, even with active survey and loaded code list

Have a look at the manual:

www.limesurvey.org/manual/Adding_a_question

You need to use {TOKEN:FIRSTNAME}, otherwise Limesurvey will look for a question with the question code FIRSTNAME.

Thank You
I work for government, and i made a personal donation of US$20.00

Great that it worked for you.

Also great that you made a donation. Only this way a project like Limesurvey can survive. But actually the government should make this donation, because at the end you are using Limesurvey. But I know how difficult it can be to convince them to donate.