Hello @Lisa Hutton,
My name is Henry and I am happy to assist with your inquiry, and appreciate you contacting LastPass Support!
I am sorry about the issues you are having with your account. Yes, Autofill is enabled by default. However, you need to install the lastpass extension. You can go to our downloads page to get the extension for the browser you are using. Once installed, please log into the extension and autofill should work.
Please let me know if this worked or if further assistance is required.
Thank you,
Henry | Customer Care