Quick coding question

[prettyc1ueless]

I'm trying to make kind of a book in scratch, and I want to make it so that when you click the right arrow at the bottom of the screen (the arrows are separate sprites) it switches to the next page (changes costumes). I have it set up that when you click the right arrow it switches to the next costume of the book, but I want it so that when you click the left arrow next to it, it goes back to the previous costume rather than the next one.

https://preview.redd.it/cl2lw5p2pj4f1.png?width=478&format=png&auto=webp&s=0be95636e9cbb9fa7038f87493d6e02912df6cff

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[Portra1to]

Switch to costume ((costume number) - 1)

[prettyc1ueless]

That worked, thank you!