Go to IB's navigation page. Log in with your IB username and password.
Go to "Transfer Funds" via the left menu.
Select "Internal Transfers" (this option is available if you have multiple / sub accounts) under the login. Then select Source account (to transfer from) and Destination account (to transfer to).
Specify the transfer amount (and currency if required), and then click "Create internal transfer"
DISCLAIMER: Screenshots for in this page are taken from Interactive Brokers website, provided only as a setup guidelines, and may be changed from time to time subject to Interactive Brokers discretion. Algomerchant is not responsible for any loss or damages caused by inaccuracy and misrepresentation of the information.