How to claim hra ?

Yes, file ITR 1 with details as per form 16, except the HR deduction. If possible give rent receipt to your HR even now, for inclusion of HRA in form 16, you will get refund of TDS easily.

Agree with the above view

File ITR for the relevant year , claim HRA applicable, and ask for refund.

"should I submit the rent receipt to IT department?"            No. But should be ready in case of any query. Only paperless ITR filing now.