By voting for their people to become judges, just like it has been done in the US.
This is why the current democratic parties voted recently to change how this voting is weighted [0], in order to make it more resilient.
> Central guidelines on the structure and working methods of the court are now anchored in the Basic Law, meaning that they can only be changed with a two-thirds majority.
> In order to prevent a blocking minority and blockages in the election of judges in the event of a possible change in the majority situation in the future, the SPD, the Union, the Greens and the FDP have agreed on a replacement election mechanism. If there is no two-thirds majority, the right to vote can be transferred from the Bundestag to the Bundesrat and vice versa.
