@lealla, Welcome to HP Support Community!
Follow the steps below to delete the printer on your HP Smart App:
1. Open the HP Smart App.

2. Tap and hold the printer icon the screen.

3. Select Forget this Printer option and select Forget.

4. Once the printer is removed, you will see an option to add a new printer.

Hope this helps!
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TEJ1602
I am an HP Employee