Annual FATMAP Premium Members
If you have purchased the annual subscription of FATMAP Premium, you don't need to don't need to do anything and you will automatically be a member of FATMAP Explore. Your expiry date will be the same as the expiry date of your FATMAP Premium membership.
Monthly FATMAP Premium Members
If you have purchased a monthly subscription of FATMAP Premium you will have access to the all the same features as before (offline maps, custom terrain tools, live list, and piste status, snow depth). You will keep all these features as long as you don't cancel your monthly membership. Once you have cancelled your monthly subscription will end.