You can rent a car with your Discover it Secured card as you would with any other credit card, if you have enough available credit for the hold that the rental agency will put on it.
Since your credit limit is equal to your refundable security deposit, your spending power is usually not as big as in the case of an unsecured card.
Using a large part of your credit to pay for a rental could also increase your credit utilization ratio to the point of hurting your credit. So I'd advise against using any secured card for this purpose.
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