Approve PERP to be used by the staking contract
Stake PERP in the staking contract
Copy your address and go to Etherscan. After searching for your address, look in the Erc20 Token tab:
You should see sPERP enter your account, and PERP exit (into the staking contract).
No, the staking APR only shows how much your staked PERP will increase in absolute (nominal) terms. PERP exchange rate does not affect APR in this case.
The number of staked PERP on staking.perp.exchange does not include PERP already in cool-down, whereas etherscan.io does not make this distinction.
Yes, the Staking Pool is shared by all Virtual AMMs.
Staking is flexible and can be done for any amount of time. A 7 cool down period applies when you begin the unstaking process. The length of the epoch can be adjusted through governance.
Some PERP rewards will be vested after 6 months. See Staking for more details.
The primary risk is exposure to volatility due to the 7 day cool-down period -- if the price of PERP changes in relation to other assets, you will be unable to swap it before the end of the cool-down.
In general, staking on Perpetual Protocol does not expose you to IL (impermanent loss) because you are staking a single asset. You can always withdraw the same number of PERP as you initially staked. However, due to the cool down period, the PERP token price may change before you are able to claim your tokens.