Freeze address

Why should I do that?

If your collateral address (The address with 1000 FIRO) is broken (spent, moved out), the masternode will be removed from FIRO network

For Firo Electrum

Go to tab Addresses, right click on your 1000 FIRO address, click "Freeze" If you want to spend your coin (Destroy the masternode), choose "Unfreeze"

For Firo QT

1. Make sure that "Coin control features" enabled

Open menu "Settings >> Options..."
Check the option Enable coin control features, click "OK"

2. Switch to Transparent Balance

Go to tab Send, in the bottom right corner, click on "Use Transparent Balance"

3. Lock your collaretals

Click on Inputs... button, the "Coin Selection" dialog will appear
Find your collateral addresses (1000 FIRO), right click on them, and check Lock unspent