EX. To specify and run the pushover analysis

Either:

select the Analysis page

or
on the Analysis and Design ribbon tab, select the Analysis Commands tool in the Analysis Data group

The Analysis/Print Commands dialog opens.
Select the Perform Pushover Analysis tab.
Click Add.
Click Close.
On the Analysis and Design ribbon tab, select the Run Analysis tool in the Analysis group.

The STAAD Analysis and Design dialog opens.
Select the Go to Post Processing Mode option.
Click Done.

The Postprocessing Workflow opens.