Repeat Rnd 1 until ribbing measures approx 1 1/2", increasing 19 stitches evenly spaced on last rnd: 111 stitches.
If I'm increasing 19 stitches total on the last round, how many stitches should be in between each increase? And also, what type of increase should I use as it doesn't say? A basic make 1?
What luvbug says is about right. What I figured is to knit 1, then M1 between that stitch and the next one. Then knit 5 and make one between stitches. If you keep working like that you get 19 and have 2 quite close together right at the round change.
If you did a M1 after 4 you would have too many, or if you increased in every 4th stitch you would have too many.
You don't have to have absolute perfection. Be sure to count at the end of the round to make sure you have 111. I would use a simple backward loop over the right hand needle or one of the M1's where you lift the strand between stitches. You can find both of those in the increase section of the free videos in the drop down menu, on the bar above.