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Welcome to the forum, you might want to have a look at the following FAQ which explains where everything is
Welcome to Benefits and Work In case you are not aware, your real name appears to be showing in the forum, if you want to change this then follow the instructions in the following FAQ
My full name is showing, how can I stop it?
If you are merely transcribing your partner's words then you do not need to sign the MR at all, although you might include a short sentence explaining how the request was produced.
If you are not using your partner's words because they are incapable of dealing with the process or lack insight into their conditions then you should explain this in the MR and sign in addition to getting your partner to do so if they are capable.
Gordon