No problem in this case as it is a sunnah and not mandatory!

I heard that during the sittings in prayer one has to sit on one leg with the toes of the other foot facing the qibla, and I usually sit on both I tried the other sitting but found I couldn’t and it was painful due to the blood disorder that I have which affects my bone.what should I do?

Prayer | July 27, 2016 2:28 am
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When we miss any prayer and pray it later, then do we have to say ikamah? Some mawlana say it is mandatory to pray the sunnah salah of fazar, zuhr and maghrib. Is it true?
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I read recently that the Prophet (Sallallahu Alayhi wa Sallam) would stop and make dua when reciting ayah on paradise and Hell is this done during all salah or only the voluntary ones