Following the launch of Stacks 2.0 on Jan. 14th 2021, users must use the new version of the Hiro Wallet to transact with Stacks. The Hiro Wallet v3 and older can no longer be used for sending or receiving STX tokens and is effectively “read only.”
In order to access and transact with your STX, login to the new Hiro Wallet available at hiro.so/wallet by selecting “I already have a wallet” after downloading, and enter your secret key associated with your Stacks holdings. Your secret key is either a 24 word secret phrase or a hardware device such as Trezor or Ledger.