How to generate a verification key for an existing wallet

Hi There!

Right now I have a wallet with a certain amount of ADA. I would like to use them as a pledge. in the stake pool registration phase I need to provide the pool-owner-staking-verification-key-file - verification staking keys for the pool owners I assume this is the pledge address.
So how can I generate the verification key of my existing wallet?

Thanks in advance!

I think I got the answer

thx @_ilap for the tutorial and @Pegasus for sharing the info