The T183 Form, is also titled "Information Return for Electronic Processing" and must be signed in Part F, where "Signature" is marked before we e-file a tax return for an individual.
The Name and Title of Legal Representative is only signed when you have a "Power of Attorney" appointed to look after your financial affair, and are not able, or capable of signing. A Legal Representative may also be an Executor of an Estate, and is signing for the Trust of a Deceased individual.
You would only sign as a Legal Representative if you are signing permission for someone other than yourself.
Your Hollingsworth and Associates Team