A coin swap is when one coin becomes another coin, for example, when VEN became VET. Using the swap feature allows users to transfer the cost basis from one coin to a new coin. This will not cause a capital gain calculation and should only be used for actual coin swaps, not trades between coins.
You can manually add the swap into your data on the Trading Tab -> Add Trades -> Manually Add Trades: Buys, Sells and Swaps -> Select Swap from the dropdown menu. Enter the date and time of the swap, the coin being swapped and the amount of the coin being swapped, the coin received, and the ratio of the swap or the total amount of the coin received in the swap.