Receiving USDT from an external address to your Rain account can be done via a QR code or by using your Rain account USDT address. 

Requirements: 

1. Rain account. You will need a Rain account to receive USDT.
2. Rain USDT address. You will need your Rain USDT address in order to receive USDT.

If you want to receive USDT using the Rain app, See below for a step by step guide

Steps (Rain website):

1. Log in to your Rain account. 
2. Click on the USDT account you would like to fund. 
3. Click on Receive. 
4. Click on Show address.

There are two ways to receive USDT in your Rain account, either using your USDT Address or a QR code.

Method 1: Using the QR code

1. Open your external USDT wallet containing the funds you want to transfer.
2. Click on the QR code icon in the wallet application.
3. Hold the device camera over the QRcode. 

Method 2: Using your USDT address

1. Copy your Rain USDT address in the field under "Your USDT Address".
2. Open your external USDT wallet containing the funds you want to transfer.
3. Paste the address into your external USDT wallet.

NOTE: USDT transfers take 10 minutes to 1 hour to arrive. 

Steps (Rain app):

1. Open the Rain app on your phone.
2. Click the receive button in the top right corner of the screen.
3. Select your USDT account.
4. Click on Show address.

There are two ways to receive USDT in your Rain account, either using your USDT Address or a QR code.  

Method 1: Using the QR code 

1. Open your external USDT wallet containing the funds you want to transfer.
2. Click on the QR code icon in the wallet application.
3. Hold the device camera over the QR code. 

Method 2: Using your USDT address

1. Copy your Rain USDT address in the field under "Your USDT Address". 
2. Open your external USDT wallet containing the funds you want to transfer.
3. Paste the address into your USDT wallet containing the funds you want to transfer.

NOTE: USDT transfers take 10 minutes to 1 hour to arrive.