Customize the profile URL generated by the user_profile_link and user_profile_url template tags

add_filter( 'mycred_users_profile_url', 'mycred_pro_adjust_user_profile_url', 10, 2 );
function mycred_pro_adjust_user_profile_url( $url, $user ) {

	// Adjust the URL
	$url = get_bloginfo( 'url' ) . '/members/' . urlencode( $user->user_login ) . '/';
	return $url;

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The above code snippet goes into your theme's functions.php file.