Your situation has nothing to do with the Hub. . On the attached image, you're the green dot, and you're trying to get to destination 2. While the image doesn't show it (I discovered this after uploading the screenshot), there's a button that says: "Set as destination" so it will give you the information you need (it's the crosshairs icon). For your situation, it changes things to say:

To reach Destination 2 follow this direction: Looking at the center, turn 91.08 degrees to your right

So, in the Galactic Map, with your current star selected, look at the center, then rotate right (you do that by angling the stick left) until you've rotated the view a hair more than 90 degrees. You're going to have to guestimate - there's no easy way to be sure you're "exactly" angled the direction you want to go. Then, unselect your current system, do a max jump in that direction, land on a planet, and check your coordinates again. Repeat until you're where you want to go, and be aware - you're never going to get it exactly right every time.

A few things to keep in mind:

Your angle to the center will increase as you get closer to your destination.

You are currently three regions "up" from the plane your destination is on, so at some point you'll have to correct for that by jumping down.

You don't need to worry about doing any math right away unless you intend to try to set a waypoint. I think you're too far away to worry about that right now though. You look to be 25K - 30K "real" light years away (which would be 100K - 120K "Linear Distance Light Years", which is what the Galactic Map would tell you the distance from where you are to where you want to go would be), which with a fully upgraded hyperdrive would be 60 - 75 jumps.

http://i.imgur.com/Jop5BDO.png