6
Once you have created your field, "text field" easiest one to try first as a start
You have to go to Permissions of the Profiles module admin, have a look at the existing permissions for other fields and adjust the Visibility (default when you first go there is "Field editable from profile") settings and the other settings accordingly, it's all fairly comprehensive and very configurable.
So if you select visibility from the drop down field (are they called that?) first, then below it, there are three more drop down fields
The Field Select the field you want to configure or set visibility for
is visible for easy option choose everyone, you can adjust things later if you want but for now everyone is fine, so you can at least see it.
Viewing a profile of easy option select everyone same as above, so for instance you can disallow viewing the webmasters profile if you wanted.
Have a look at the other options in the same drop down field as where you chose "Visibility" from.
With the site specific fields I created I didn't want anonymous to see those only other registered users so I had a bit more messing around to do.
It's involved at first but you will get the hang of it and this is coming from someone who couldn't create forms and fields if my life depended on it. I am still learning it, but there is a start to at least make them easily visible for everyone.
You can see what the existing original fields are set to so you can get an idea of what to do as well.
Hope that made sense lol.
Cheers....;o)