Noob confused on GDAX

Noob confused on GDAX

I was trying to convert bitcoin to ether after buying bitcoin on coinbase. I now know to transfer to usd wallet and buy on GDAX. My question is when I hit the btc to eth tab it would not let me conevert to ether on a limit order. Are you not allowed to convert these on here or ami just doing it wrong. I put in the ether amount equivalent to my bitcoin balance. Please clarify as I had to pay $20 fee to transfer bitcoin to Binance. Thanks in advance!!

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