How to set the data to automatically increase according to the line in google sheets

I am new to AppSheet. I have google sheets where I have an ID of my customers and other information about them like email, phone etc. On my main screen, I have a list of ID, name of the customer. And in the bottom corner, I have add button. I would like to know how to setup add button so when my employee click on add ID in add screen would automatically be setup according to google sheet. For example, my last customer will have the number 600 and the next customer will have automatically number 601, already written in line when i open add screen. I hope i describe my question right.
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Thanks for any help.

Thank you.

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