How do I make a face flush with its vertexes?

So how do I flatten a face of a shape?

Here’s a link if the picture doesn’t work:

Find the add on loop tools in scripts and themes section here at BA and use the flatten tool for one way. I would just eyeball it cause my stuff is not so perfect so maybe there is more easy way.

Scale along the “z” normal axis to zero. (“s” “zz” “0”), or use the manipulator in normal orientation to scale on “Z”

Alrighty, thank you very much for both your help, problem solved.