Add the following line to location where you want suggest box to appear
<Custom:AutoSuggestBox id="Control ID" DataType="Supported Data Type" runat="server" CssClass="Text Box Style" MaxLength="Max chars in TextBox" Columns="Num of visible chars"/>
For example:
<Custom:AutoSuggestBox id="asbCity" DataType="City" runat="server" CssClass="FormCtrlStyle" MaxLength="100" Columns="30"/>