This guide is for when using your PC with a keyboard or mouse, if your connecting remotely from a windows touch screen device such as a tablet you are best to use the free Microsoft remote desktop windows store app.
Go to windows start screen, click on the start button if your not already on the start screen (1)
Start typing "remot.." (2), windows will auto search for that app. When the blue remote desktop app is showing press enter to open the app (3)
Type the name of the PC to connect to (4). Click connect or press enter. (If its a remote computer you will need more details than just the computer name)
When prompted enter your username and password (6) if you PC is connected to a domain (in a business network) you will need to type the domain name also (7 below)
For domain computers (7)
Agree to connect even though there is no certificate (this is typical) (9). Optionally check the box so it doesn't ask again for the connection (8)
Once the connection has been made successfully you can control the "other/remote PC" by interacting with the desktop the way you normally would as if you we using it "locally". Note that you can "disconnect" by clicking the X in the blue bar (10) but normally when you are finished you should log out of the remote PC using the start button as normal.