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The short answer is, I don't think this can be done.
As an aside, K 1.6.3 is not supported (you should upgrade immediately to K 1.6.4); saying that you have J 1.6 is a bit vague. J! 1.6.0 is defective (and so is J! 1.6.1); J! 1.6.2 do not work with Kunena. The only version of J! 1.6.x that works with Kunena is J! 1.6.3 and the only version of Kunena that works with J! 1.6.3 is K 1.6.4. (Of course K 1.6.4 works with J! 1.5.20, J! 1.5.21, J! 1.5.22 but we recommend J! 1.5.23 if you use J! 1.5.x)
As I tried to indicate earlier, the Kunena user profile does not easily cater to the issue you have described. There are, however, alternatives that you may want to consider. One of those is to use Community Builder which allows for the definition of custom user fields and the integration of some of that information in Kunena using the cb.simpleboardtab plugin provided with CB software.
That being said, however, the fact remains that Kunena user profiles are relatively inflexible in this regard in the current version (K 1.6.4) and this cannot easily be changed at the moment. It is hoped that a future version of Kunena (after K 2.0) will be offer more scope to change this. Apart from the alternative that I have just mentioned, the short answer is that there is not a lot we can do at the moment.
You are not alone in this matter and, if this is an essential requirement, further development can be done to deal with the question. Given the limited resources available to the developers (and unless there are people willing to sponsor the work) this is how things currently are. Perhaps someone else may have other ideas; I have only tried to explain that it's difficult (but not impossible) to do this at the moment.
Thanks, sozzled, for the explanation.
Yesterday, I tried adding CB to a test site (mirroring the basics of my project), and was quite baffled.
Might I explain my focus, since I'm at once nearly done with the project and yet stuck at a seeming impass.
I've added two fields to registration ("child's name" and "classroom") with the intention of using them in the Profile, and in the Registration email sent to administrators so they can correctly identify the person requesting membership.
Would you be willing to talk me through what you mentioned with the cb.simpleboardtabs? I don't see that plugin anywhere in the CB I downloaded.
Also, though this isn't the forum for it, could you explain how I would add those fields to the registration email sent to administrators for approval?
This matter was resolved. The problem was more about how to display customised information in a user profile but not, necessarily, the Kunena user profile and to link the Kunena forum to a user profiling system containing the extra information. The specific solution involved the use of Community Builder software.
I think this is something that you may like to ask the people who wrote the user profile "plugin". People need to understand that this new "plugin" is a concept, based around a Wiki article that shows people what they would need to do. In other words the User Profile plugin link given in the last message is only a reference to a guide, not a reference to a fully-assembled and supported feature of Joomla.
There is no harm in experimenting with Joomla's features. There is also no harm in asking questions about experimentation here, on the Kunena forum, either. I only want to point out that it may be difficult for people to contribute to this interesting discussion in a forum setting. Perhaps, however, someone may like to contact you directly and suggest a few ideas about what you can do. I, personally, do not know the answers myself.
Good luck and we hope that someone will soon offer to help you with your very interesting project.