Need help to transfer domain registered with cloudflare to different cloudflare account

I am currently following the guide mentioned here

The domain transfer process depends on your DNS settings. If Cloudflare is your authoritative DNS provider (that is, your domain nameservers point to Cloudflare), you must:

Create a new Cloudflare account or log in to an existing Cloudflare account.

1. Add the domain to the account (as if you were adding it for the first time).
2. Log in to your domain registrar account and update the nameservers to the provided Cloudflare nameservers.
3. Finalize the nameserver update by selecting your domain in the dashboard > Overview > Re-check now.

The domain transfer process depends on your DNS settings. If Cloudflare is your authoritative DNS provider (that is, your domain nameservers point to Cloudflare), you must:

Create a new Cloudflare account or log in to an existing Cloudflare account.

1. Add the domain to the account (as if you were adding it for the first time).
2. Log in to your domain registrar account and update the nameservers to the provided Cloudflare nameservers.
3. Finalize the nameserver update by selecting your domain in the dashboard > Overview > Re-check now.

But I am having issues in updating nameservers in another cloudflare account as there is no option to update the nameserver. So what shall I do ?

Move a domain between Cloudflare accounts · Cloudflare Fundamentals...

You will have to move or transfer domains from one Cloudflare account to another if you: