Yes, the moment you swapped one type of crypto for another, you had a taxable event.
Your basis in the first crypto was the FMV when you bought it (probably what you paid for it if you used dollars).
Your sales price is the FMV of the second crypto on the date that you did the swap.
To enter, go to Wages & Income->Investment Income->Stocks, Cryptocurrency, Mutual Funds, Bonds, Other.
If you have a 1099-B enter it; otherwise, enter the data as best you can.