BlockTrades requires users to create an account to trade

**Is your feature request related to a problem? Please describe.**
https://steemit.com/blocktrades/@blocktrades/blocktrades-users-must-now-create-an-account-to-trade-with-us

**Describe the solution you'd like**
Update UI.

**Describe alternatives you've considered**
Disable blocktrades.

**Additional context**
Add any other context or screenshots about the feature request here.

Start by reviewing the linked BlockTrades announcement and locating the BlockTrades trading flow in the UI. Clarify whether the intended outcome is to update the account-required flow or disable BlockTrades, then confirm the behavior manually in the affected trading path. Done means the selected behavior is clear and consistently reflected in the UI.

Written by the indexing model from the issue text.