I have a problem

Hi I'm new at making maps and I have one big problem.
When I want to start make simple room you know "box" i cant make floor here is an example

Please help me cuz I dont know what to do

 

Im thinking somebody would help me
And sorry for bad english

 

Once you've drawn the shape you want, press 'Enter'. That will make the box.

 

I already done that in other way I would not post that image

 

Im not entirely sure what you mean when you say you can't make a floor.. When I first started with Hammer, I used this guide to get a grip on the basics. Perhaps you'll find your answer following this..

https://developer.valvesoftware.com/wiki/Your_First_Map

On second thoughts, I think you have the viewport set to 3D Wireframe.. Click on where it says 'Camera' in the top left of the viewport and switch it to '3D Textured'