Limits, packages and details can be changed at any time without recreating the account.
CHANGING THE PACKAGE
WHM > Account Functions > Upgrade/Downgrade an Account. Select the account, choose the new package, and apply. The account's limits change immediately; the site is unaffected.
CHANGING INDIVIDUAL LIMITS
WHM > Account Functions > Modify an Account. Here you can adjust the disk quota, bandwidth, account limits, contact email and primary domain independently of the package.
Use this for one-off exceptions. If you find yourself making the same exception repeatedly, create a package for it instead.
CHANGING THE PRIMARY DOMAIN
Possible from Modify an Account, but it does not update the domain inside the client's website software. A WordPress site will still hold the old address in its database and must be updated separately.
CHANGING THE PASSWORD
WHM > Account Functions > Password Modification. Note that this may also reset the account's database password depending on the options chosen, so check before applying it to a live site.
BEFORE ANY SIGNIFICANT CHANGE
Take a backup of the account. Changes are fast to make and occasionally slow to undo.
