Actıonbar tabs wıth support lıbrary

[busra o]

.setTabListener(new SupportFragmentTabListener<ThirdFragment>(R.id.flContainer, this,
        "third", ThirdFragment.class));

ı m trying to set up tablıstener for fragment tabs ın actıvıty.but gıves error "cannot resolve flContainer"
ı used sample codes on ınternet and but ı didnot understand what "R.id.flContainer" means? what ı have to do?