Open the presentation,
1. On the ‘Home’ Tab → Editing → Choose → Replace option.
Top left of the screen, then click Find → Replace option.
2. New window pops-out. Find what box.
3. In the find what box, you can enter the word ‘Miss-pelt school name’.
4. Then in the replace with box enter the correct ‘school name word’ and then click ‘Replace All’ option.
5. Now, the correct school Name will be changed in all slides.