If you can't log in at the forum to change both those things from your profile, you can still change them from the database directly. Although changing things in the database directly is not rcommended, in this case the changes are very minimal and they can be done very safely imo.
First of all make a backup of the database.
Then to change the email address, run the following sql query at the SQL tab of the phpmyadmin of the database that you have used to install your Ipb forum.
UPDATE core_members SET email = 'youremailhere' WHERE member_id = x;
To change the password run this sql query:
UPDATE core_members SET members_pass_hash = '$2y$10$0.QFIEyYUJuic7Rf9WwbJ.tygzTTn3L5qkzDJ6wqv1m7DnZctUREK' WHERE member_id = x;
For the first query, replace youremailhere with the actual email address that you want to use and replace x in both queries with your actual member id.
The second query will change the password to test. After you log in, you can change it to something strong and secure.
And if you are using a custom prefix for your database tables add it to the table name at both queries.
Hope it helps.