@KokoPebbles Please use descriptive titles for topics - Please do not post a support request without first reading and following the advice in https://retropie.org.uk/forum/topic/3/read-this-first
(Understand you are visually impaired, but I assume you are able to read the website/forum via large fonts/high constrast/text to speech etc).
What problem are you having with the calibration? I'm not sure anyone can do a better step to step instruction than our existing official documentation. I have no idea what guides you have read but this is the official one -
https://retropie.org.uk/docs/First-Installation/
Please follow that and go into more detail what you can't do etc.