Direct Ledger integration is not currently available on BSC. To use a Ledger you must connect it through MetaMask.
Step 1: Unlock your Ledger wallet by entering your pin on the device
Step 2: Open MetaMask and select accounts
Step 3: From the drop down click on “Connect Hardware Wallet”
Step 4: Select Ledger from the available options. Click “Unlock Wallet” to see a readout of your available addresses
Step 5: Follow the instructions on the MetaMask page to select the preferred wallet
Step 6: You are now ready to use your Ledger wallet with MetaMask on IDEX BSC
Make sure you have that wallet selected on MetaMask and your Ledger unlocked any time you wish to trade with your Ledger on IDEX BSC.