Allow Trust

Enter the trustor. This is the account to be authorized

Enter the asset code

Select the source account. This should be the asset issuer

Toggle the authorize button. Yes for authorize, No to remove authorization

If you want the operation to be sent later, click on "Save", to add it to the operations queue and you are done.

To submit the operation to the network now, continue with the steps below

Click on "Send"

Then build and sign the transaction.

Submit the transaction