A. You can create optin forms using HTML form creator.
You can add custom fields and copy/paste the code to your 3rd party website.
A. In the new version, advanced features is moved to two different places.
1. General features are at /admin/wizardadmin
2. Other features are under the settings for the page that they apply to. For example, all features related to joining, such as what to do when a member tries to join when they do not have a referrer, are accessed by clicking on the icon on the top right of the join page, and then selecting settings from the drop down.
If there is a specific setting that you are trying to find, let us know what it is, and we will help you find it.