If you sold/traded cryptos in 2017, then you must complete an amended return as noted by @marilynjoy. On the other hand if you purchased them in 2017, then traded them in 2020 you will enter them as a sale of Investment Income.
In TurboTax Online you will find Cryptocurrency as a selection under Investment Income
In TurboTax Desktop you will enter Cryptocurrency as a Stock, Mutual Funds, Bonds, Other, under Investment Income
You can choose to enter a group sale, and send the detail information with Form 8453, after your return as been acknowledged. The instruction and mailing address can be found with the form.
Note: It is your responsibility to maintain records of each purchase, and each trade or sale from the first transaction, including the dates, as proof of your transactions of purchase and sale (for tax purposes).
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