I can't check my usb key

I have download Etcher and i put the tails .img but i can’t check my usb key, what i doing ?

If you ddon’t understand, i can’t select my usb key in the target.

Hi there, in case you are using Etcher on mac, you might find useful this thread: Etcher doesnt recognize USB drive · Issue #1969 · balena-io/etcher · GitHub
Could you please give me more context regarding:

  • The Etcher version you’re running.
  • The operating system you’re running Etcher in.
  • Is your USB detectable from your operating system?