You can use mobile banking, online banking, direct banking or any branch to pay funds into your Cash ISA.
If you've got more than one type of ISA, just make sure you're not paying in more than your ISA allowance of £20,000 for the current tax year across all your ISAs. Tax years run from 6th April to 5th April the following year.
Additionally, you can choose whether you want to pay in lump sums, or set up a monthly standing order to help you save more regularly.
Your account is not meant for everyday payments. You can't set up Standing Orders or Direct Debits, have an arranged overdraft, or receive your salary, wage, pension, or benefit payments directly into your account.