Google translate (Japanese) from both heading and post:

When I sent the PC with sound forge 13 installed for repair, it was installed cleanly. Tell me how to do this authentication on another PC Sound Forge 13 on

PC he sound forge 13 sounds like a PC

You can go to My Products on your MAGIX account and de-activate any current activations. You should then be able to activate a new install of Sound Forge 13 on your repaired computer.

No idea what 'sounds like a PC' is about but maybe that's just a translation problem.