Furnace is broken

Put the summary of the bug you're having here
Furnace broken
What I expected to happen was...:
Describe what you thought should happen here
When i want to put coal it doesnt work
What actually happened was...:
Describe what happened here
Broken
Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...fix the bug put new update 0.7.1
3. ...fix other bugs like signup button