There are a couple of glitches on the app but the main bugbear is the position of the send button. When you type a message long enough to fill the long narrow text box the last couple of characters go underneath the send button which means you can't see them to correct them when needed. More often than not you end up sending an uncorrected message by mistake.

Can you just move the position of the send button out of the text box. Just place it above, below or to one side.