The Relational System - Mastering phpMyAdmin 3.1 for Effective MySQL Management - page 182

The question mark top icon displays a panel that explains where to click, in order to
select a relation for subsequent deletion.
Let's click at the appropriate place to delete this relation. We get a confirmation panel
on which we click Delete .
We can then proceed to recreate it. To do this, we start by clicking the Create relation
icon. The cursor then takes the form of a short message saying Select referenced
key . In our case, the referenced key is the id column of the author table; so we bring
the cursor on this column and click it. A validation is done, ensuring that we chose a
primary or unique key.