If Tsw2 Shows Me To Hit The "underscore" Button, Which Button Should I Press On A German Keyboard?

Hello all! I've been playing TSW2 for a while now, and I never really understood what button I need to hit when for example wanting to upload DTG Live Railfan Screenshots.

I really wanted to make my first Railfan Screenshots and get them uploaded, however I never really understood what button (on a german keyboard) I need to press for it to be uploaded.

If there isn't any button on a DE Keyboard that can be pressed in order for it to be uploaded, can I change that keybind somewhere?

Thanks a lot!

 

For DTL screenshots I think that's spacebar (Leer).

Cheers

 

Thanks!