ArcGIS Online - How to add a field and edit values

This process begins after importing a CSV containing three college addresses. ArcGIS Online is displaying the college locations "on the fly". The sheet has a field error. To fix the error we must convert the sheet data into a feature layer, then we can add a new correct field and delete the field with errors.

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Please, I have a problem, I don't have the Perform Analysis icon in Map Viewer, how do I show it ?