I have an arduino board but the jumper pins are seperate from the board itself.
Q: How should I attach this? solder? glue?
I dont want to make a mess and have the solder drops touch each other pins.
Standard Soldering techniques should be used. If you need, get some prototype/vero/strip board and practice first. As @ignacio has mentioned, the solder mask will help as long as you don't glob on the solder. Most importantly, use flux and you'll be fine.
As an experienced solderer. I recommend using blutack to adhere it to the board and the solder 1 pin in. Once this is done, you can reapply heat to that pin to align it. Continue with others