How do I replace the cracked glass of my display?

I found the replacement glass by itself for your model here. I also was able to find a guide for that replacement here. Hope this helps!

Yes, you can replace just the glass covering the display. There is a well written step by step guide to do this under the mid 2010 version of the mac book pro model A1278. It is messy and make sure to use protective glasses and gloves thick enough so glass shards don’t puncture your fingers. I was able to buy the glass cover with 2 sided tape on it online for less than $20. It took some time but was worth it.