Replacing a failing disk

[JamesI03]

Hello, I have a couple questions about replacing my disk. For context, I have 2 virtual machines running on a 128 GB SSD in its own pool and I want to replace it with a 500 GB NVME NAS SSD. Is it as simple as going onto the pool, hitting replace and clicking on my new SSD or do I have to create a new pool for the new SSD and do some zpool stuff in the shell? (I want to keep all the data from the VM's).

If I need to do zpool config can someone please talk me through it as I am new to TrueNAS and have little idea of what I am doing.

Thanks!