I am no expert but this is what I have learned over the past few weeks while trying to learn how to care for my anemone and watching mine.
Light
Flow
Food
Anemones need a good light source and weekly feedings. They will move to wherever they feel most comfortable. Give them a tall rock to walk up, this will allow them to choose to move closer to the light and up into a high flow area if they would rather.
Take a look at its mouth. If its mouth stays wide open then its possible it is not happy with the water chemistry and is gasping.
Make sure its foot isn't torn. Never try to physically move your anemone. Simply aim a powerhead at it and it will start to release itself and move. Once your anemone is most of the way released then you can gently try to lift it.
If you could send a photo it would allow us to see its overall color and its placement.
Again, I am not an expert by any means. Take this for what its worth (just my 2 cents).