If you want to change the place where the text should be displayed (either left or right) of the radio button. You can use text align Property of asp:RadioButtonList.
Change it from Left or Right.
<asp:radiobuttonlist id="rblDirections" xmlns:asp="#unknown">
runat="server" RepeatDirection="Vertical"
TextAlign="Left">
<asp:listitem text="East" value="East" />
<asp:listitem text="West" value="West" />
<asp:listitem text="North" value="North" />
<asp:listitem text="South" value="South" />
</asp:radiobuttonlist>
Hope this Helps.