2. Turn them on now by clicking the 'CC' icon at the bottom right. 'At' is more appropriate to use in term of the position. The position of icon is more exact. See the sample below. Prepositions and Place When English speakers refer to a place, we use in for the largest or most general places. You can say that “VOA is located in Washington, D.C.” And “for the best food, try the restaurants in Chinatown.” For more specific places, like certain streets, we use the preposition on. You may know that President Obama lives on Pennsylvania Avenue in Washington, D.C. Finally, we get to the most specific places. For exact addresses or intersections, we use the preposition at. If I invited you to visit us here at VOA, I would say, “Come to my office at 330 Independence Avenue.” To be exact, it’s at the corner of Independence and 3rd Street.”

You can tell the kid to cover himself with the comforter.

I have not heard it being used often in the US.

The first thing people look for after they bought their phone is a mobile phone cover.

Diapers are baby diapers. This new material will make the absorbent better if it is used to make the baby diapers.

Yes, it seems like erectile dysfunction. (LOL)

Option 2 is the correct one.