These suggestions are all wrong. The anemone is going to go where it's happy with the flow, lighting, and water conditions.
1) If you turn the pumps off and it happens to settle, turning the pumps back on will change the conditions, and chances are it will unattach again.
2) Pressing it against the rock or into a hole is only going to stress it and probably damage it.
3) Leave it alone, don't touch it, and it will find a suitable place (if there is a suitable place in your tank).
2Addicted has given the only useful advice in this thread in my opinion.
Turn your pumps on, and let it find a place on its own.
Judging from your member date, your tank isn't that old. Anemones do much better in more established tanks with pristine parameters.
How old is your tank? What type of lighting are you using? What are your water parameters? What size tank? What are you using for circulation?
Handling it and forcing it into a spot will only stress, damage, or kill it. Just let it be.