You can access your funds any time by withdrawing from the Digit app. There are no limits on how much or how often you can withdraw. Withdraws usually settle next business day or sooner.
To create a withdraw:
1) Open the Digit app
2) Tap into the goal or fund you'd like to withdraw from
3) Tap "Withdraw" at the bottom
4) Enter the desired withdrawal amount
5) Please note the estimated arrival date