>>937236389
Now you want to "Mask" the areas you want to change, so assuming you want to remove a bikini you draw over that bikini and hit save.
That said, there's a few things that will making your final results a little better.
Draw the mask to include just outside the borders of what you want to change. I use a lower opacaity setting to better blend the edges of the mask along with a round brush and I set the mask to negative to make it easier to see what I've selected.