Help with increasing

I have to increase evenly across a row what does that mean?

it means space out your increases so they’re not all lumped in one spot. so, if you have 100 stitches, and you need to add 10 more, you’d knit 9 or 10 and increase, knit 9 or 10 more, and increase, etc. it just gives a cleaner look and helps keep the fabric from puckering and doing other weird things.