If you are using a wallet to try to stake and it does not work, use another wallet for it. The wallet that I know that can stake also is Trustwallet, but it is close source.
Maybe try. I can send energy other account? I am a beginner.
So i make other account Trustwallet, and if succes stake, i can send energy? because i see energy exchange, but this problem, i no can buy, i think need energy for transaction...