Transmission.

Car can be useful only on first or second gear (1)(2). D – goes very slowly but moves a little bit like below 1 Mph and there is no reaction when gas pressed. R- Works as it did and that’s about that. If anyone knows what can it be or how to fix it/rebuild it please don’t hesitate to write. Also on case how to change transmission any advice would be helpful and I believe that there is nothing impossible. Thank You for your time.

change the fluid and filter and see what happens.