I contributed $2000 to my Trad. IRA a few days ago and realized that I should have put it into a ROTH IRA.

Which sections of Form 8606 should I fill to recharacterize
the above ?

Thanks

You don't recharacterize by filling out a form, you recharacterize by physically having the custodian redesignate the account (if eligible), or moving it to a Roth IRA.

Let me rephrase the question .
Which sections of the form-8606 need to be filled to report the recharacterization to the IRS ?

Thanks

You must complete Part 111


The form can be found at
http://ftp.fedworld.gov/pub/irs-pdf/f8606.pdf
and the instructions at

http://ftp.fedworld.gov/pub/irs-pdf/i8606.pdf