To receive tokens, you need to send your wallet address to the sender.
How to get it:
Open the Wallet
Click on the account with tokens that you want to receive
When you first start you will have only one account for TON
Press Receive
In the opened window click on the address - it will be copied to the clipboard
Send the address to the sender of the token
You can also request tokens from another person:
Click on Create invoice
Enter the amount of tokens you want to receive and comment on the request
Click Share Invoice URL - the link is copied to the clipboard
Send the link sender tokens
For the link to work properly, the other person should also use Crystal Wallet