There are two ways to do this, the easiest is to open the drive in your browser and just drag the file where you want it to go.
Drag method:
1. Open drive.google.com
2. Find the folder you want to add the file/folder to.
5. Drag the file/folder from the file explorer into the browser window.
Example;
Let's say I want to move a file in a folder I created called Test over to a folder called Bills Code Violations for a home in Central Properties.
1. First I want to open the location to move it over to
2. Now I can click and hold on the file and just drag it over to the other window.
3. And now we can see that the file is in the correct place.