How-to 6 steps, run in order in one session. Every step was executed against the engine and the output below is what it produced.

Step 1

Plot[Sin[x], {x, 0, 22}, PlotLabel -> "sin(x)"]

Output

-Graphics-

Step 2

Plot[Sin[x], {x, 0, 22}, PlotLabel -> Style["sin(x)", FontSize -> 18]]

Output

-Graphics-

Step 3

Plot[Sin[x], {x, 0, 22}, PlotLabel -> Style["sin(x)", FontSize -> 18], Background -> StandardYellow]

Output

-Graphics-

Step 4

Labeled[Plot[Sin[x], {x, 0, 22}], "sin(x)"]

Output

Labeled[-Graphics-, sin(x)]

Step 5

Labeled[Plot[Sin[x], {x, 0, 22}], Style["sin(x)", "Graphics"]]

Output

Labeled[-Graphics-, sin(x)]

Step 6

Labeled[Plot[Sin[x], {x, 0, 22}], Style["sin(x)", "Graphics"], Background -> StandardYellow]

Output

Labeled[-Graphics-, sin(x), Background -> StandardYellow]

Label a plot

Functions used