When to top-up your account
You have to top-up your account when you would like to change to a paid subscription after your free trial period or extend your current paid subscription.
What currency to use
Making a deposit step-by-step guide
Login to your GMSG account and navigate to "Settings" via the main menu:
Scroll down to "Subscription payments":
If you have never made a deposit before, you have to generate a personal ether deposit address by clicking the button that you find there:
Once an address is generate for you, things look like so:
Topping-up with ETH from Binance
When sending ETH from Binance, make sure to check the "Ethereum" network option like so:
Topping-up with BNB from Binance
When sending BNB from Binance, make sure to check the "BEP20" network option like so:
Check also this article for some more warnings and disclaimers.