Tezoro tracks the activity status of your wallet by checking your address’ "nonce" - a special counter that shows the number of transactions sent from your address. If your address’ nonce does not change for a month, Tezoro starts an inactivity counter and will launch your will & backup after the period of inactivity you have defined.
You can specify an address that Tezoro will add to the smart contract whitelist. This address will be able to trigger the execution of your Digital Will directly through Etherscan. Here’s the 20-pages guide with screenshots: https://docs.google.com/presentation/d/1ZS1OJHLfXpas4QqhnZLlvoppdP4peZRjCpqaf8LvYSg/edit#slide=id.p.
Withdrawal of funds from your address is carried out by providing a smart contract allowance for withdrawal of funds. Any amount below this number can be withdrawn. Don’t worry if the amount is colored red when assigning allowance - you can approve allowance of any amount.