Income tax returms

Hi,

I need one information. I changed 2 compnies so i have 2 form 16 for this year. Durning the filing i see i tax payable section has some amount.

My question is in the second company i did not show HRA, so how can i change that now?

I have already filled the ITR and it shows in tax payable section i have to pay some were around 50k, so do i need to make a payment now or i need to wait to get aknowdledgement and then pay the tax?