Just in case you are just reading the Actor's edition of The Crucible, here is some stuff you are missing. It's at least in the Penguin Collection and Library of America publication. The text is inserted in Act One by Arthur Miller.
In case you cannot read this, these will be printed out, or the pages can be found online. (Note from Jacob: Click the pictures to enlarge them. It might take a few clicks until they're readable :))