answersLogoWhite

0

It depends what computer system you're using. On this one (wiki.answer.com) you first type just H2O, then you highlight the '2', then you click on x2 in the set of items above the text. To highlight the '2' move the cursor to the right side of it, then push and hold the Shift key down and then move the cursor over to the left.

User Avatar

Wiki User

12y ago

What else can I help you with?