You can do it by changing the database directly. If you have something like phpMyAdmin that is a good way to gain access. Enter this SQL.
INSERT INTO `core_config_data` (`scope`, `scope_id`, `path`, `value`)
VALUES ('websites', '0', 'dev/debug/template_hints', '1');
When you are done with path hints just delete the matching record from core_config_data
Or update the value
field to 0
instead of deleting the whole record, it will probably be the last one since you've just added it.
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