Make sure you followed these important steps for staking: Visit the staking platform, connect your wallet, select the storage node you want to stake to, and follow the staking process to approve transactions in your wallet. If you're experiencing issues, it might be due to not having enough SUI for gas, so ensure you have sufficient balance. If problems persist, try to troubleshoot using the staking dApp interface; it may offer diagnostic messages or indicate any setup steps you might have missed such as insufficient Testnet SUI. Visit the dApp and review any prompts carefully.

First, make sure your browser is refreshed and you're on the correct page for staking. You should have Testnet SUI tokens available as they are needed for the transaction fees or 'gas'. If your wallet is not showing the correct balance or giving errors when trying to stake, double-check that your wallet is properly connected and has the necessary Testnet WAL tokens by converting some Testnet SUI to WAL if needed.