So I didn't know how to use Uniswap to buy $MTA, one of the new DeFi coins that isn't on major markets yet.

I was completely unsure how and almost gave up.

It was actually pretty easy. Here's how:

Head to http://uniswap.org  and launch it

Connect your wallet

Select a token. You'll note that $MTA isn't available by default. You'll need to search for it using it's contract. You can find this on Coingecko

Once you enter the contract, it should pop right up.

Now you're ready to swap. Enter as much $ETH as you want or hit max. It'll give you a rough conversion. You can set up how much slippage you'll allow in the top right settings.

Submit it, and confirm it (in MetaMask at least, not sure about others) and wait for the swap.

Then enjoy your swapped crypto!

(Thank you @CryptoMessiah and @icebergy_ who helped me out because I was pretty nervous about using it my first time)