How to delete a clinic on the iOS app
On the left navigation menu, look for "Clinics" and click on it
You will then be shown a list of the clinics you've added
There's an "edit" button at the right side of the clinic you want to delete

Tap on it and you'll now load the clinic details
You'll see the delete/archive icon at the top right (see image below)

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How to delete a clinic on the web browser app
go to Clinics
click the edit button

click the delete button
