Pressing Y obviously bring up the Chat however if u type something and i make a typo pressing i don't know what the button is called

the one above (ENTER) the one that erases text... anyways... one cannot HOLD it in to delete large amount of text one have to delete 1 letter/Digit at the time by tapping the button continuously!!! & sometimes even that fails and the text you previously typed are undeleteable & u just got to hit enter to post it to solve the problem as of now, then open a new Chat by pressing Y...