I talk to Sheba daily, just to say hello & asking her how her day is going. I also tell her often that she is a "good girl". I don't care what anyone says, they respond well to "positive" attention, just like any animal would.
Also, when I feed Sheba, I take her out of the tank to feed her in a separate dish since this keeps her tankwater more clean. I put her down on a towel to dry her off, snap my fingers at her & tell her to follow me into the kitchen (she doesn't like to be carried). She always follows me (like a dog), then I pick her up to put her in her laundry tub with water & food so she can eat.
People who see me do this can't believe a turtle would listen to me in this way. But I have said it time & time again that a way to a turt's heart is thru her stomach. She knows she gets fed in the kitchen & that I am the one who makes it happen.
Anyone who wants to "train" their turtle to follow them, can do it easily by carrying a piece of fish in your hand, hold it up to the turtle's face (like leading a donkey with a carrot) and walk away slowly (holding the fish close to the turt) so they follow you. Eventually they will do it without you having to hold the food & they will most likely follow you all over the house when you let them out. It's very cute!