Select "Advanced" under your wallet in the right-hand menu.
Select "Build transaction".
Select the coins you wish to spend.
Paste the bitcoin address of the recipient in the address field.
Write a label for this transaction, so you know what the transaction was for or who you sent it to.
Enter the amount to send. It must be lower than the total value of the coins that were selected for spending.
Press the “Max” button to send the whole selected amount (if you want to move the funds to another wallet you control).
The amount you enter must be in Bitcoin. Wasabi provides an estimated value in fiat currencies.
Select a mining fee. You have a sliding bar to adjust the fee amount depending on how quickly you want this transaction to be accepted by the network. You can enter a custom amount as well. There are several methods of looking up the current fee rate, one being mempool.space.
To enter a custom amount, you have to enable "Manual Fee Entry". Go to "Tools" > "Settings".
Click on "Build Transaction".
Click on “Export Binary PSBT”.
Select the SD card and click on "OK".
Eject and remove the microSD card from your computer and insert it in your Coldcard.
Click on "Ready to Sign".
Verify the transaction details on your Coldcard and confirm the transaction by pressing on the checkmark.
Once the transaction signed, remove the microSD card from the Coldcard and insert it into your computer.
In Wasabi Wallet, select "Tools" and then "Transaction Broadcaster".
Select "Import Transaction".
Select the file ending with ".signed"
Click on "Broadcast Transaction"
The outbound transaction will appear in the "Transactions" tab and the coins will be deducted from the available balance in the "Send" tab.
If you did not send the full amount available to spend, you will receive some new coins that you will see in the "Send" tab. That is the change that is sent back to you after you sent the payment.