unable to submit moves on mobile???

Hi, I downloaded chess mobile, clicked on it and saw my games then went off for a couple of days. When I went to make a move, however, that was a different matter, I could get into the game and move the piece I wanted but the "submit" selection was not highlighted, only the "exit" I could see submit but not select it, how frustrating!!!! I have apologised to the people that I was in the tournament with (hence my reason for needing this) but I am pretty p'd off and disapointed, any ideas as to why? The phone is a samsung G600. Thanks in advance.

Dunno, I used it on a Samsung SHG d900i, and it worked fine, although I had a little trouble figuring it out. Just play with the navigation keys, eventually you can select everything....