[RTMdotORG]

ok all you need to do it...
go to edit templates>>>memberinfo>>>memberinfo_block_contacti nfo

find:

<if condition="$prepared['hasimdetails']">
		<fieldset>
			<legend>$vbphrase[instant_messaging]</legend>
			<div class="fieldset_padding floatcontainer">
				<div><phrase 1="$prepared[username]">$vbphrase[send_instant_message_to_x_using]</phrase></div>
				<ul class="list_no_decoration" id="instant_messaging_list">
					$block_data[imbits]
				</ul>
			</div>
		</fieldset>
	</if>

and remove.