I do tech support for Toast Wallet.
Importing an account is done from the 'Add Existing Account' screen and requires the Ripple secret and passphrase for that key. Get there by hitting the '+' on the main screen.
Do not confuse IMPORTING an account with ADDING an EXISTING account. Existing account refers to restoring from a Toast wallet backup/ Importing is adding an account created elsewhere
When creating an account in Toast the user will end up with three pieces of info;
This is, as mentioned above, a privacy feature to keep others from shoulder-surfing
requirements specified on input screen
six words, all lower case, separated by a single space with NO characters before after
It is a REALLY GOOD IDEA to have Toast running on multiple devices/platforms. This tests the restore process and backup data and should be done ASAP after any account changes.
A new backup should be taken when account data is changed or added. Backups are snapshots of the account data when the backup was taken. Always restore the newest version