To enable this form, you need to add its name to the WEBFORMS field by editing Web Preferences (in your Wiki Web). Then, each time you edit a page, you will have the opportunity to add a form (there is a new button) from a list of forms and then input values for its fields.
To create an index table (with a subset of the fields), you need to write a SEARCH query. Note that the resulting table can be sorted by clicking (once or twice) on a column header.
Editing a form can only be done in a topic page. What is interesting is that we can use the Wiki topic page for capturing a discussion and the rationale for this requirement, on top of the form. The discussion can then be summarized by providing another search query. For instance: