Options for allowing client to make changes? (I'm subscribed to Lite plan)

I am currently subscribed to the “Lite” Account-Plan at $24/mo…
I use it to design/build sites, then export the source code/files to upload to my clients’ host.

My current client has already purchased a hosting plan and domain through HostGator.
However, they would like to be able enter News, make minor changes, etc.

Since they already bought their own Hosting/Domain, I don’t want to upset them…
In other words, if required, the cheapest route possibile would be preferable.
I’m hoping I can somehow utilize my current $24/mo Lite Plan to make this happen.

What are my options here?
Thanks in advance!