This page covers the basics of using STAAD.Pro CONNECT Edition with Ram Concept for Advanced Slab Design.
For complete documentation see STAAD.Pro Help - Contents - Design - Concrete Design - Advanced Slab Design
Additional information is in the RAM Concept Help - Manual Chapter 15 Data Transfer from STAAD.
There are a few basics steps in the process.
Start with a complete concrete model with a flat concrete slab using plates. Include columns or walls and loads in the model at a minimum.
Here's a short video of the process.