In case the admin prefilled the poll whilst being logged in to his account you can't edit your entry. Please contact the admin of the poll. He has to delete the entry you want to edit. If he wants to prefill the poll with the names of the participants he has to log out of his Doodle account first. Only then the participants will be able to edit the entries.
It seems that you are using the Dragon Dictate. Unfortunately, Doodle is currently not compatible with this browser plugin. You should either deactivate it, or use another browser for Doodle.