contribution to roth ira and tax form

i work as an independent consultant somewhere without any benefits. i filed my 2013 taxes just last week. but i have not made any contribution to my ROTH IRA for 2013 yet, but I was planning to do it before april 15 2014. but because i filed my taxes already I can not contribute anymore? or I don't need to fill a tax form for contribution to ROTH IRA and I can still contribute for 2013?

I looked at IRS form 8606 and it seems only for traditional IRA. Am I correct? or is there another one for Roth IRA?