Edit content\skins\flat\index.html file

Search for ‘{include file="boxes/box_profile.html"}’

And comment the if loop around the above string

For example in version 3.5.1

<!--

{if $auth_express != "yes" && $AllowCreateAccount != "No"}

<div {if $box_displayed == "1"}style="padding-top:6px;"{/if}>{include file="boxes/box_profile.html"}</div>

{assign var="box_displayed" value="1"}

{/if}

-->

in version 3.4.4 and higher

<!--

{if $auth_express != "yes" && $AllowExpressCheckout == "NO"}

<tr><td>{include file="boxes/box_profile.html"}</td></tr>

{/if}

-->