The key is always saved as a file, it does not need to have an UI export function.
Just copy the key.
The keys for PARITY are always in the same folder, so for Windows, this is the USERS "your_user_name" AppData Roamig Parity Ethereum Keys "keys_for_your_node" folder, type Ellaism or Classic or Ethereum or Musicoin.
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for other user who do not know
