Click here for a video tutorial
How to modify an existing hosting account in Plesk.
This tutorial assumes that you have already logged in to Plesk.
Now let's learn how to modify an existing hosting account.It may
become necessary to modify an account if an existing customer needs more
storage space, bandwidth, or other resources.
This is the end of the tutorial. You now know how to modify existing accounts in Plesk by changing the limits assigned to them.