Do you mean how to set up the king of fighters 98's setup menu? The method is as follows:

1, open the toolbar "Games" of the king of fighters 98.

2. Select "Redefine the key position setting R", followed by 4 players, with the first one taking precedence by default.

3. Here you can see that those are up, down, left and right. There are some buttons. Select your own settings and click OK.