It would be best to put the code in the functions.php file in your theme directory (under wp-content/themes/). You can read about Filters and Functions.php.
You can place the following code at the end of the functions.php file on a line before the ?> that ends it. This way you won’t have to update the code every time MyCurator is updated. You will have to re-add the code to functions.php when you update your theme.
I haven’t tested it but it should remove the blockquotes and leave the link, but you will have to adjust it for formatting such as spacing or line breaks.
add_filter('mct_ai_postcontent','my_curator_filter');
function my_curator_filter($content){
$content = strip_tags($content,'<a>'); //strip tags, but leave the link <a> tag
//Add any other formatting to the $content variable here
return $content; //make sure to return the $content
}
For reference the filter is applied in MyCurator_local_proc.php, just search for mct_ai_postcontent.