How do I access code repository?

Once you have access to the code repository, you can access the repository via 

Fisheye : https://code.mobilehealth.va.gov/ 

         or 

Stash   : https://coderepo.mobilehealth.va.gov.

What is the user id and password for code repository?

The user id and password for code repository (fisheye/stash) is the same as the user id and password you use for JIRA/ Wiki and the other ALM tools.