$\log_{2}$ is “Log base $2$” which means “Exponents we put on $2$ to make various outputs”. The input is the value you are trying to get. The output is the exponent you need to put on $2$ to get the desired input. For each value of $x\text{,}$ ask yourself “What power of $2$ gives me the $x$ value?” The answer to this question goes in the output box. Drag the points to the coordinates from your table. The graph will become viewable when the points are placed correctly.