Is there a way for me to change the characters I added？ It makes me write 裡 but I want to write 裏

It depends on the list you're studying from. The person who made the original list chose to use either 裏 or 裡. If you want to write the former instead of the latter, you'll need to make your own lists.
But it appears to me that 裡 is far more commonly used than 裏.

In novels from Taiwan, I want to say, the 裏 is commonly used.

Would love to know why!