Script bug, can't change a "Saldo:"

Bug description:
when i try to update a “Saldo:” it doesn’t work i can provide you the error after

Expected vs Current Behavior:
i wanted to make my script change a “Saldo:” in another page, for like a bank site, because it’s too difficult for me to make change that all by hand, and it does not work

Steps to reproduce:

Bug appears at this link:

Screenshot(s)/Screen Recording:

Browser/OS/Device: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/ Safari/537.36

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