1) Select your token to swap 'From'
2) Select your token to trade to swap 'To'
3) Enter the amount of tokens to trade 'From'
The estimated tokens you'll received based on the pool token ratio will populate on its own. Changing one changes the other to the correct ratio.
NOTE: THE FIRST TIME USING A TOKEN ON GOSWAP, YOU MAY NEED TO APPROVE GOSWAP TO SPEND THAT TOKEN IF SEEN BELOW:
Hit 'Approve ETH' (or whatever token your trading From) and MM will popup a confirmation.
Once you've approved your token, you may need to refresh and re-enter your trade info:
4) Hit 'Confirm Swap' in popup screen
5) MetaMask will popup, hit 'Confirm'
No need to change gas on the GoChain network, default fee always works with <5 second blocks currently. This fee as of August 2019 is 3/10000th of a penny.