Added info to explain Generic providers such as Newznab.

src/UI/Settings/DownloadClient/Add/DownloadClientAddItemView.js

@@ -39,7 +39,7 @@ module.exports = Marionette.ItemView.extend({
     },
 
     _add : function(e) {
-        if ($(e.target).closest('.btn,.btn-group').length !== 0) {
+        if ($(e.target).closest('.btn,.btn-group').length !== 0 && $(e.target).closest('.x-custom').length === 0) {
             return;
         }
 

src/UI/Settings/DownloadClient/Add/DownloadClientAddItemViewTemplate.hbs

@@ -4,6 +4,9 @@
     </div>
     <div class="pull-right">
         {{#if_gt presets.length compare=0}}
+        <button class="btn btn-xs btn-default x-custom">
+            Custom
+        </button>
         <div class="btn-group">
             <button class="btn btn-xs btn-default dropdown-toggle" data-toggle="dropdown">
                 Presets