Download MathWallet: https://www.mathwallet.org
Switch to the Binance Chain wallet
Open the Binance Chain Staking tool in the DApp
Click + Stake
Select Validator
Delegate to XXX Validator
Enter the amount and click stake to complete the stakeing
Note: After successful staking, the unstaking process will take 7 days.
If you just want safe and easy income, you can stake BNB in MATH VPOS Mining Pool, enjoy double return of MATH + BNB with same lock-up period, details can be found at : https://mathwallet.org/vpos/
If your BNB is in BSC wallet, and need to transfer to Binance Chain wallet, check:
https://blog.mathwallet.org/?p=2052
Review validator detail information and ranking
https://www.binance.org/en/staking