two options:
1) download the app if you have an android phone. send the ID to your new wallet along with some ETH. import the ID from mainnet to everchain (that's where the gas comes in) from there, follow the buttons on the app to select amount and the duration of the staking period. if you really want to hold long-term, staking for a year gives you 40% more tokens.
2) go to
https://wallet.everest.org/ and create an account. then follow the same steps. move ID and ETH to wallet, import to everchain, stake.
there are video tutorials too but i don't have any bookmarked.