That looks fine, just out of adjustment. Specifically, brightness looks to be turned up way too high.
Fortunately, basic adjustment isn't too tough.
To set color intensities:
Hit test mode. Black screen. Adjust brightness control until the screen is actually black.
Color bars. Turn up contrast until things start to "bloom". Back it off until they don't AND the top two white bars are distinguishable (depending on the wear and tear on your tube, one may happen before the other).
Color bars still. Adjust brightness until the bottom white bar is totally black, and the second white bar is almost black.
Color bars still. If the three colored bars (red, green, blue) don't look about the same, repeat the above procedure but using the appropriate color's "drive" or "gain" control in place of "contrast", and "bias" or "cut off" in place of "brightness". Do this until all three colors look the same, then repeat the above two steps to re-set the overall settings.
On the off-chance you can't get the brightness turned down far enough, you can bump the "screen" control on the flyback (big black box on the monitor circuit board with a big read wire coming out of it and 2 knobs) down a hair (and I do mean a hair - it's really touchy), then try the process again.
To set geometry (picture size/shape):
Bring up a grid pattern (should also be in test mode). The basic adjustments are horizontal and vertical size and position. Basically, set it up so that the edges of the grid are snug up against the usable edges of the tube. Your monitor may also feature pincusion and trapezoid adjustments. Pincushion adjusts out bowing or curvature in the left and right sides, while trapezoid adjusts out problems with the top being wider than the bottom (or vice-versa).
This is overall an iterative process. If the monitor's pretty close to correct, you usually only have to do brightness/contrast and geometry. If it's really far off, you'll probably have to iterate over the color intensity process a few times. On monitors that are really far off, even seasoned professionals will run through the process more than once to really dial things in, so don't get flustered.
If things still look bad afterward, post a picture of the monitor with the color bar test showing and somebody can probably make other suggestions based on that.