It seems I can only call or raise but never bet all my chips.
Above the red play buttons you see the slider, you can move that to the end and go all in that way. Or just move it a bit to raise. Also you can type the bet amount in the raise box.
Also some info in this topic, with screenshots.
http://support.replaypoker.com/replaypoker/topics/putting_in_a_raise
Greetings Happiness.
thank you Clemson mac