I am as beginner as can be.
I tried to install an extension (now realising it was probably a mistake).
I logged out of the webpage.com/admin menu and now I can't get back into to fix anything. I did backup the site before I did anything so hopefully, I can restore that.
Can anyone please give me basic step by step to fix it? I am a beginner and coding and I keep reading about something /var but I don't know where you would even get into this option.
If you remember the module maybe you can disbale the module on /app/etc/modules/Vendor_ModeuleName.xml (this has to be done manually).
Are you receiving a Magento report?