I created my ci mesh on my laptop and I completed the mesh long before I got my new computer. Everything looked fine on my laptop but now that I've transferred the mesh to my desktop, there is this ONE face that is black. I just deleted it so it's empty.
I have tried to click on three vertices then "f" to create a face. I have tried to have the face option selected rather than vertices and click on the three vertices I want but it's just not... no.

EDIT: I figured out what I was doing wrong but now I find that no matter which way (counter-clockwise or clockwise), I'm still going to get a backward face.

then select the face and choose reverse vertex order from the menu.
To check other faces(sometimes you can not get the normals right because of a neighbor face is reverted aswell) then right click in your 3d window and (un)tick draw backfaces.