Virtual columns can have computed formulas that are dependent on other virtual or real columns but an app user cannot directly edit a virtual column(VC).
So just as an example if you have a real column called say [Phone Number] and another real column as say [Customer Name] where the app user can enter phone numbers, customer names in a form view, you could have another VC called say [Customer and Phone] with an expression such as CONCATENATE( [Customer Name], " - ",[Phone Number]) or any other such expression.
In summary, VCs are computed columns -either system generated or configured by the app creator to display, further use computed value in other expression but they cannot be directly edited by the user.
For adding user-editable field to your app, please add a real column back in the database and regenerate the table in the app editor.
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