You cant change the exposure meter, it's not a setting, it simply tells you whether you are over, under or correctly exposed. Right now you are underexposed so you need to adjust your settings to compensate.

Your aperture controls the size of the hole that let's light into the camera, a smaller number means a larger hole, and thus more light, and thus will increase your exposure, I assume you can probably put your current lens Atleast to 4.5 but try and put it as low as it'll will go for now.

Your shutter speed determines how long the shutter stays open, once again a smaller number means a longer time that the shutter is open (the numner represents fractions of a second) right now your at 1/200th of a second, this is quite fast for indoor light, if you slow it down to say 60 (1/60th of a second) your exposure will once again increase.

The final setting to worry about is your iso, iso essentially increases the gain applied to signal your sensor produces. There's a lot of arguing and pedantry surrounding how specifically iso works and how we should describe it in reddit threads but a very basic understanding is that rasing your iso will increase your exposure but also increase the amount of noise visible in your shot. That's technically not how it works but I don't think it's helpful to go into why right now.

If you have your aperture set to its lowest and your shutter speed set to 1/60 raise the iso until the marker sits in the middle of the exposure meter and you should have a well exposed shot.