My ADHD was/is pretty bad, but I learned to type just fine. Even learned on a manual typewriter.
Also lost a 10 page paper in high school because the computer crashed. Rewrote the paper during lunch and study hour because I had to turn it in that day. Learned to save frequently from that experience. Conveniently, deadlines help with ADHD concentration. It's one of the reasons ADHD people procrastinate. Once the pressure of the deadline gets bad enough we are usually able to focus on the task at hand.