You're presented with the following screen, where there are two corresponding drop-down menus:
Use the first dropdown option to select ETH. As a reminder, you'll be exchanging some ETH for BOTTO tokens through Uniswap.
Specify a quantity of ETH you'd like to exchange to BOTTO.
Use the second dropdown option, copy-pasting this address into the search bar:
You might be able to claim BOTTO tokens because you were eligible for an airdrop. To check eligibility, head to the Botto app and look for a red 'Airdrop' button. If you don't see this button, you were not eligible for the airdrop. Airdrop details are specified in this Gitbook.
Then, hit Swap.
You will be asked to Confirm Swap, which in turn will generate a prompt from MetaMask.
Hit Confirm - then wait for the transaction to confirm! As soon as the transaction completes, you'll have your BOTTO tokens.