[kh99]

Do you want to remove the restriction? Then I think you can edit the usergroup and set Custom Avatar max width, height, and filesize to 0.

If you want to have a size restricytion but just remove the message, then you can edit the modifyavatar template and remove the part that looks like this:

<vb:if condition="$show['maxnote']">
	<p class="description">{vb:raw maxnote}</p>
</vb:if>

which appears twice in the template.