how do i put my splits into that?

Which part are you having trouble with exactly? If you have your splits uploaded to splits i/o you'll find them on a page such as https://splits.io/41r in which case you will need to enter 41r into the splits i/o ID field when submitting the run. Alternatively you can just copy paste the entire url and the site will extract just the ID for you.

To upload your splits to splits i/o you need to use https://splits.io/upload or LiveSplit can upload them from within the program. I'm no expert on that though so see https://splits.io/faq for more information or someone here can explain it better.