Can I fix this? Help!

I am new to knitting and very much still a beginner. I made a blanket and now that I’m finished I can see I must have added and dropped stitches through out and my edges are wavy. Is there any way to add stitches to a finished blanket to even out the edges? Tia!!

Welcome to KH and to the world of knitting!
Congratulations on finishing the blanket. You could add a border to it by picking up stitches along the edge and knitting or you could crochet an edging onto it. The edging can be as simple or as fancy as you’d like either a single row or a lace like edging.