Support renewals are accessed by going to the Macrium website, mousing over the Support header, and clicking "Renew Support" -- direct link here
. However, renewals are not available for the Home version, which just includes one year of support with the license. It also does not include entitlement to free upgrades to any major releases that occur within the support period as the business-oriented versions do. Full info about support options is here
I use Firefox (63.0.3 as of this writing) and I can access the user guide just fine. Is this
the link you're using? If so, do you perhaps have an add-on active that might be causing problems? At the top of the navigation sidebar along the left column, there's also a "Complete User Guide" link that allows you to download it as a PDF, in case you'd find that useful.
To access the scheduling wizard for an existing definition file, open Reflect, go to the Backup Definition Files tab, right-click the definition file of interest, and click Schedule.