While active, use the Up and Down arrow keys to move through the list of choices. Use the Right arrow key to select the currently displayed choice. Use the Up or Down arrow keys to move to the choice you want to make. Use the Right arrow to select that choice. Observe that the asterisk inside the parentheses is erased from the other choice and written into your choice.
Some fields have space for a single line of characters.
Use the Up and Down arrow keys to move to the text entry field. Type your text. Some fields have space for large or unlimited blocks of text, with the ability to move around in them, revising your entry before submission. A submission button or link. Select this with the Up and Down arrow keys as usual, and then use the Right arrow key to submit the form you have filled out.