The "birdhouse" icon on the bottom left is you feed of who you're following. On that screen, lower right, is a feather pen button for posting.
npub1gcxzte5zlkncx26j68ez60fzkvtkm9e0vrwdcvsjakxf9mu9qewqlfnj5z is the developer. Give him a follow!
Discussion
That's interesting, I don't have any of those icons on my version, something must be up