Dinomay, If you want to tell someone you like their picture you can just click the Blue Thank You at the bottom of the screen. They will see your name at the bottom of the screen. My name is HelenW. See my name at the bottom of your screen where you posted your picture.
That means you liked
the quilt or picture or comment. Otherwise, click on reply and write a statement to the person, or
you can click on Quote and it will put that persons comment on the screen you are typing on and then you write what you want about it.
Notice that once you clicked on the Thank you, and your name is added to the bottom, you no longer have a Blue Thank you because you already add your Thank you. HelenW