I learned from this document:

https://developers.refinitiv.com/en/api-catalog/eikon/eikon-data-api/quick-start

but I did not see the [Gererate a new Application ID ] bottom,why?

The pic your can see on :

https://i.loli.net/2018/06/07/5b1889772eafe.png

<img src="https://i.loli.net/2018/06/07/5b1889772eafe.png" alt="trquestion.png" title="trquestion.png" />