Steps:
- https://idex.market/balances
- Click on Deposit for Eth
- Make sure your Metamask address has Ether in it.
- Sign the tx.
- Wait for it show up in Idex balance.
- Go to https://idex.market/eth/pnk
- Fill buy orders for whatever Eth you want.
- Wait for the order to be fullfilled.
- Go to https://idex.market/balances
- Withdraw PNK tokens back.
Tada! Done!