First thing is you need to have an account on KuCoin and have it KYC verified and then check all the necessary participation criteria and then you can simply click "Participate Now". Its very easy, just dont forget to have loads of KCS once the token sale starts. Good luck!
See more details here: https://coinscribble.com/what-is-bitbns-bns-token-simple-steps-on-how-to-participate-on-kucoin-spotlight/43148/uncategorized/53/