Sally:
Are you sure you are wetting it all the way thru? The fact that it looks good in the morning tells me that it is wilting in the sun because it loses water faster than it can take it up, not because of some root problem. I have that here in Oklahoma when I move a young tree into full sun. I get around that in a couple of ways. One, put the plant in dappled shade, filtered shade, where only a portion of the sunlight comes thru. You can also put the pot in a pan with about an inch of water in it; the potting medium will soak that up as the day goes on.

Another possibility is that you are watering once and the water runs thru without being soaked up by the potting medium. You can try watering twice; once about a half hour after the first watering. Use a LOT of water.

All this assumes that you have a potting medium that drains well and is airy.

you could be over watering also...the leave would wilt if the roots rotted. this happen to me when i thought my plant needed more water be instead it needed less. the leaves were wilting because of the salts in the fert. I misdiagnosed the problem.

wow, thank you very much for your answers...
I will try watering more, it is very very hot here and I think the plant doesn't like it, got it in filtered shade now,as you ox suggested and of course it was just planted a couple of days ago. I don't want to loose it as I love, love, love figs so much and you can't buy any here in Texas.( I got here from CA) I will watch for over watering too, I think probably later on when the plant is more established, thanks again for your input, its very much appreciate it