回答“What kind of glue to reattach back”If your screen popped off, it’s probably because you have a swollen battery. If you don’t replace the battery, it will just happen again. So take advantage of the fact that your screen is popped off (it’s a pain in the neck to get off otherwise) and change out the battery. You can get a replacement battery here on iFixit or from Amazon. THEN you can glue your screen back on.