Can I use the bot using facebook login ?

No. Here is what you can do:

• Login to ogame website using facebook
• Click "My account", then "Generate Gifting Code" for the account you want to use the bot with
• Logout
• Register a new gameforge account
• Go to "My account", then click "Enter code", and transfer the account over
• You can now use the bot using the "gameforge account credentials"