Multiple Meter Readings, beeping gas meter, recently switched from another supplier

Hi, I’ve got three properties listed with Bulb, but can only see the meter reading for my house. I need to submit first readings to avoid estimated bills. I can’t see how to do this anywhere.

My gas meter is making a beeping sounds every couple of minutes, could it be the battery gone wrong?

Finally, I recently switched from another supplier who has given a massive estimated final bill (for my Mums house) and they tell me I have to give the final reading to Bulb to get a revised bill. I can’t do that because of the first point and SSE are now chasing for payment.