The original front-end form for submitting corrections (which would then be posted on our submission forums automatically) was discontinued out of necessity, due to how the IPB forums evolved (they rewrote their API) in combination with security concerns. It would still be possible, but at this moment I/we do not have the resources to make this happen. Everything from spam control to validation etc would require manual implementation; not such a trivial task.
Regarding the reference to the form: the only reference I see in the TT guide is the following sentence: "Clue level not known please submit level and picture of clue using the form at the end of the guide. Thanks".
@Ksb Single This phrase should indeed be adjusted/removed.
The second issue about the display name is an IPB forums specific issue. I'll have a look if I can somehow correct that.
Thanks for your feedback.
EDIT: I've confirmed/reproduced the "second issue" but I can't fix it via usual means; it's an IPB forums bug. We'll report it, that's all we can do for now.