Method Community

I think it's somewhat difficult to be fully registered 3rd party method apps. isn't it? Then, there is no choice but to use third party portal, I think. but, I assume users only view data field in his/her own transactions, not other transactions. my question is... Is it possible for portal users (in customer table) to view/add/edit data ...

Is it possible to customize user login & logout page with customized logo? (default page is https://www.methodintegration.com/method/login.aspx )   I think customized login page can be done with customer portal, but I assume that the customer portal is limited to add/edit data but view data only.