1: Login to Horizon:
User Name: your TACC username
Password: your TACC password
2: If you are on more than one allocation, select the project (XSEDE allocation) by clicking where it says "tacc · TG-xxxxxxxx · RegionOne" and choose the appropriate allocation.
3. Click on your username in the upper right hand corner
4: Click on Download OpenStack RC File v3
The password is not stored in the script. This openrc.sh file will prompt for a password when sourced.
Note: To select an active project prior to generating openrc.sh, click on Identity (left hand side) to see a list of your projects.