I can do it on the iPad,not got a iphone! Tap and hold on screen until you get like a magnify circle then let go,you will then see a copy which you tap after extending dots on page you want to copy,then tap on your reply post,tap on screen again it will then say paste tap paste,then alter how you want to send your post,then send !!! You can do that with anything just copy what you want,close the page,then open were you want it,then paste!
Hope that helps Hun!
Right here we go,on top of this page tap > next to copy post,then put your reply at bottom,tap go advanced then tap little square with A in it,put your reply,then tap on you emotion,check preview,then save changes. Then tap top left hand corner( lighter life foram),then tap right hand corner and tap refresh page,bingo!
Hope this helps you too lol!