Where do I start?

What if I’m both?

Common, and completely fine — plenty of people who own a flat in a society also let one out somewhere. Sign up for each. They stay separate on purpose, so the society’s money and your tenant’s rent are never mixed into one figure.

Were you given a code?

Then most of the work is done — somebody has already set your flat up and is waiting for you. The code does not make your account, though. You make the account; the code attaches it to the right flat.

• Your landlord gave you a code → Rentio for Landlords, despite the name. Make your account, then enter the 10-character code on “Join a lease”. It attaches you to the tenancy they have already set up and opens your own page of their register — what you have been charged and paid, your receipts, your annual HRA statement and the log of your deposit. You can read all of it and change none of it.
• Your committee sent you an invite for the flat you own → Rentio for Societies. Make your account, then accept it, and the flat’s dues, receipts and payment history are there — with the notices, the bye-laws and minutes, the clubhouse calendar, the helpdesk and the gate.
• You rent inside a society and were given nothing → that is correct, not an oversight. The invite belongs to the flat’s owner. Make an account in Rentio for Societies and ask your committee to add you to the flat’s resident list. You then get the notices, the helpdesk, the directory, bookings and the gate. The dues stay with the owner — which is usually the whole point.

At the gate: you send an expected visitor a pass before they arrive and the guard checks them in against it. The guard’s screen names the flat and never who lives in it.