Same here, android, unable to figure out how to place a bot. Everything that made sense (select robot, tap in arena, tap bottom bot name and tap arena. Even double tapping didnt work. Gave up too.

Update. Got two bots (at least based on count), I have no clue how, started fight, but there is nothing to be seen, just black background. Battle finished and again everything black except the menues.

I am fan of bot wars and would love to play it, but this is just too frustrating to use.