Hi,

Please follow the below configuration steps

1) update your operator preferences 
2) In the Designer Studio header, click the name of your current application, and click Definition.
3) On the Integration & security tab, in the Agile Workbench integration section, click Configure integration. 4) Select Pega Agile Studio.
5) Fill API URL for Pega Agile Studio URL and connect 
6) Feed in product ID and Release ID so that created User stories and Bugs go into this and release is tagged 
7) Click Begin integration.
8) Click Done.

https://community.pega.com/system/files/pdfs/agile-studio-73-implementation-guide.pdf

https://community.pega.com/system/files/pdfs/agile-studio-install-guide-731.pdf

Thank You

Refer this article,

https://community.pega.com/sites/default/files/help_v74/procomhelpmain.htm#project-delivery/agile-workbench/proj-integrating-proj-mgmt-app-tsk.htm