Orbot use in Iran ( I am Iranian) in Iran

I have orbot , but don’t understand the bridges or ehat to do to connect at all , i got a little from you all , but please a step by step instructions would be very helpful. Bridges ? Nodes ? What to put where . Need help .

There are restrictions. So i cant download another vpn from appstore. I luckily and very sneaky downloaded orbot last minute.