You've plenty of choice! Log into the app to add cash straight away using Google/Apple Pay, debit card or an easy bank transfer (note π: easy bank transfers aren't available for pensions). You should also know that the minimum is Β£100 for the first time you add cash to your account and the name and address used for the payment must be your own.
Or, if you want to automate the way you add cash to invest within your account, set up a direct debit from as little as Β£25 each month.
Finally, you could also transfer cash and/or investments (if they're available on Dodl) from another ISA, lifetime ISA, pension or general investment account to Dodl, for free!