Hi,
You have changed it wrong. To correct it, please do the following changes.
<div id="ttr_footer_designed_by_links">
<span id="ttr_footer_designed_by" style="color:<?php echo '#428BCA';?>;font-size:<?php echo '14';?>px;">
<?php echo(__('Theme Designed by',CURRENT_THEME));?>
</span>
<a href="
http://templatetoaster.com" style="color:<?php echo '#428BCA';?> !important;font-size:<?php echo get_option('ttr_font_size_designedbylink','14');?>px;">
Myles Sinclair
</a>
</div>