Which code are you looking to use RC designer with? One way to find out if you have a license for that code is a green/red circle alongside that code in the license segment of the opening screen of the program.
Have you checked whether you can perform a design of a concrete beam or a column with that code? In the folder
C:\SProV8i\STAAD\Examp\US
you will find a file named Tut_02_rcframe.std. If you go to the Design-Concrete page on the left side in the modeling mode, you will notice instructions like the following in the view on the right side of the screen.
START CONCRETE DESIGN
CODE ACI
UNIT MMS NEWTON
CLT 25 MEMB 1 TO 5
CLB 30 MEMB 1 TO 5
CLS 25 ALL
FC 25 MEMB 1 TO 5
FYMAIN 415 MEMB 1 TO 5
TRACK 1 ALL
DESIGN BEAM 2 5
DESIGN COLUMN 1 3 4
END CONCRETE DESIGN
Depending on the code you intend to use it with, go into the editor, and change the code from ACI to the desired one (keep a backup of the file before you do so) and then run the analysis. View the output file and ensure that the design has been performed successfully.
If you can't make any progress on this, create a service ticket at
www.bentley.com/serviceticketmanager
and one of the analysts will contact you.