You can't lug-kit miniature breaker frames
Breakers of this general design type (double-size miniature breakers) are not equipped to accept what is called a lug kit that allows field conversion between connection types as a general rule, unlike their bigger brothers (known as molded case circuit breakers in the industry).
So, you'll need to get an entirely new breaker for this, one that has line and load lugs factory fitted. The correct GE part number for the new breaker is a GE TQD22125WL -- you should be able to get this through an electrical supply house that carries GE's line of products.