Welcome jessica, My daughter has an
Ibiza and they are great cars.
Forums work real easy, you go to your car section
https://forums.seatcupra.net/index.php?forums/ibiza.22/
Then select the particular model you have (MK1, 2, 3 ETC), Either do a search using the search bar at the top or via going through the various threads and if you cant find the answer then raise you own thread with a title that sums up what you are after (eg Rear lights are dim can I replace them with LED's) in the body put in enough info about your car and explain what you are after and hopefully somebody will
help you.
If you want to do other stuff then go to
https://forums.seatcupra.net/index.php#seatcupra-net-additional-resources.228 where you will find a list of forums to
help you.
Or check out the for sale section if you are after some second hand bits.
Enjoy your car and share some pics when you can.