Here is a simple guide on how to buy ERC20 Tokens during an ICO using the myetherwallet.
Try accessing your wallet going to https://myetherwallet.com1 -> View Wallet Info. Here you can select to access using the JSON file you saved:
Try sending some ether to your new adress. This can be from an exchange such as Bittrex, Kraken, Poloniex, etc. You’ll be able to see your balance on the top right after accessing your wallet, along with your account address and QR code to the left.
To send the Ether go to Send Ether & Tokens:
You’ll have to add your credentials to access your wallet. After that you’ll see a transaction window like such:
Notice the ‘Data’ field. If the ICO provides a data hex, it is imperative that you don’t forget to add it.
After you send that payment you can monitor it’s progress on etherscan.io2 with the transaction hex it will give you.
When viewing your wallet info (as you did above) notice in the bottom right where it says Show Tokens, you can click that and it will expand with a long list of tokens such as:
If you were successfully able to purchase ICX tokens, you’ll be able to see them there!