Weird! I have my ipad in front of me and the “submit” button is there. The only thing I can think of is that my ipad isn’t up to date (ver 4.3.4) so I guess there must be some compatability issue with the newest version (5.1.1?) or the version you are running.
It will probably sort itself out in time. Let me know what version you are running and if it still doesn’t work I will email Chrs to see if he knows.