Assistance Needed with Editing Pegels Water Stand on Website

Hello WordPress Team,

I need assistance with editing the "gauge water level" on our website. A company previously programmed this feature for us, but unfortunately, I can’t get in touch with them anymore as they have stopped their business.

I remember them mentioning that this process involves using PHP, and I’ve noticed there’s a cron job set up on the website to collect the data. However, I’m having trouble finding how to adjust or update the API to make the necessary changes.

Could you please guide me or point me in the right direction for making these adjustments?

Thank you for your support!