Not Knowing the du'aa in the Witr salaah

Q: Salaah-655: If one does not know the Du'aa Qunoot, what should he recite in the Witr salaah?

Answer: One must start learning the Du'aa Qunoot. but until one has not learnt it, one may recite (ALAAHUMGFIRLEE) thrice and if this is not possible, then one may( YAA?RABB) thrice. And Allaah knows best what is most correct.

Fatawa Rahimiyyah vol.2