Uh! Now I see what you mean! Well... there is no setting in Feedback module that I can see... So, the only way I could do it is to alter ViewComments.ascx file in DesktopModules/Feedback folder. Find the following code there:

<TD colSpan="2">
    <asp:label id=lblAuthor runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "CreatedByEmail") %>' CssClass="head"></asp:label>&nbsp;&nbsp;
    <asp:label id="lblCategory" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "CategoryID") %>' CssClass="subhead"></asp:label>&nbsp;&nbsp;
    <asp:label id="lblDate" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "DateCreated") %>' CssClass="subhead"></asp:label>
    <asp:label id=lblFeedbackID runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "FeedbackID") %>' Visible="False"></asp:label><br>
    <asp:label id="Label1" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "Subject") %>' CssClass="subhead"></asp:label><br>
    <asp:label id="lblMessage" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "Message") %>' CssClass="Normal"></asp:label>
</TD>

and add code in red:

<TD colSpan="2">
    <asp:label Visible="False" id=lblAuthor runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "CreatedByEmail") %>' CssClass="head"></asp:label><!--&nbsp;&nbsp; -->
    <asp:label Visible="False" id="lblCategory" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "CategoryID") %>' CssClass="subhead"></asp:label><!--&nbsp;&nbsp; -->
    <asp:label id="lblDate" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "DateCreated") %>' CssClass="subhead"></asp:label>
    <asp:label id=lblFeedbackID runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "FeedbackID") %>' Visible="False"></asp:label><br>
    <asp:label id="Label1" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "Subject") %>' CssClass="subhead"></asp:label><br>
    <asp:label id="lblMessage" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "Message") %>' CssClass="Normal"></asp:label>
</TD>

Oddly enough, name of a sender isn't saved to a DB. It is only used inside the message text to indicate who the feedbacker is. Only email is saved to the DB.

If you want that kind of functinality added, either modify module or buy/write a custom one...