This page doesn't support screenshots so I'll give you the old-fashioned walkthrough.
When you press the orbital deploy button, you should be shown the orbital deployment menu.
This menu should have two tabs, Vehicles and Robots. You want to select vehicles.
You should see a list of all the Vehicles that you have inside your space platform hub. If you don't see a scout-o-tron here, you need to craft one and put it in your hub.
If you do see it, select it. The first button with the armour plate icon allows you to configure the vehicle's grid. There is a bar on the right that shows you all the equipment you have available. you can see how many you have by hovering over those buttons. If you don't have roboports or solar panels, craft those, put them in your hub.
Once you've done that, click the green marker button, you will get two tabs again, this time Utilities and Equipment.
For utilities, you need to select some quantity of construction bots; these will be placed inside the scout-o-trons' inventory when deployed.
For equipment, it should tell you a list of the equipment you just placed inside the scout-o-tron. If this is empty, you need to click manage equipment grid and put equipment in the grid.
Otherwise, you're good to go, you can hit deploy, and the scout o tron will launch from the hub and land on the surface.