I think that I turned off all the pumps in my tank, then put the anemone in a spot that I liked and held him there for about 30 seconds, and then let go. After like 5 minutes, I started to turn the pumps on. I turned like 1 on every minute until they were all on. If he gets blown off the rock, turn off the pumps and wait like 10 minutes to turn them back on.
Of course, he moved to where I didn't want him to, but that's what they do.