If this website is meant to be used as an in-person training, participants should already have access to a large-scale compute system, via:
Participants should also have a computer which can connect to the internet, in order to log into the relevant resource via the network. If special accommodations are needed to access the resource via the network (IP addresses, a virtual private network (VPN)), these should also be in place.
If this website is meant as a reference, or self-paced course, readers need no special preparation with accounts, as one of the episodes will show them how to apply for one.