I have had it for 5 days and it still hasn’t attached to anything, it’s mouth was open and ai gave it a piece of krill, but it won’t eat, he is still sticky to the touch
Tank looks too new. Do a water test. I suspect you have elevated ammonia or nitrite. I suspect this is bothering him and that’s why he won’t attach. Definitely don’t feed until it attaches and is happy.
If your tank is new, I suggest you take the anemone back until the tank matures, they don’t do well in new tanks and likely won’t survive.