After you've opened your ISA account, click:
Which takes you to this screen:
From there you can fund your ISA by:
Debit card, so that you can immediately put your money on the market and start earning interest.
Moving cash from your Investment Account's Wallet.
Bank transfer which typically take 2 business days.
We also support transfers in from other Cash, Stocks and Shares, and Innovative Finance ISA managers. Transfers from previous tax year ISAs do not deduct from this year's ISA allowance.