3rd person is hifsid fir male and hifsida for female.
In generalyou wrote well, but I want to refer to two things.
In spoken Hebrew it sounds like you wrote hefsid, but in presice recitation, we would pronounce hifsid. The second thing is that in spoken Hebrew we often say hifsadetem hifsadeta, with a short vowel of a. So well done, almost perfect, just diffirante between spoken and formal language.