If you are unable to finish your transaction because you are stuck in the page for selecting the transaction speed, please check if you have enough balance left in your wallet to pay for the selected transaction speed/fee.
After selecting the amount you want to transfer, the transaction fee is added to that amount. It is therefore important to take into consideration how much of that token you will have left in your wallet after choosing the amount you want to transfer.
Note: Erc20 tokens are on the Ethereum blockchain and require ETH to pay for the transaction fees on the Ethereum blockchain called gas. If for example you want to send an Erc20 token like ETHOS, you will need some ETH to pay for the transaction fees.