Thank you everyone for your advice. I followed the instructions and now everything's working fine. Such a relief to have lights when just moving in, I really appreciate all of your comments.
I will definitely not use a trial and error approach again, no matter how desperate. Thanks again all.
Please help someone
I recently moved into an apartment and one of the dimmer switches wasn't working. So I bought a replacement, but when I went to replace it I found 3 red wires (unlike any videos or tutorials I have found).
So I copied the set up of the previous (broken) switch and put...