Hi Joe-Fghy, I hope your doing well despite the problem you are experiencing now and I'm sorry for that. For that let me try to assist you.
Here is an example steps on how to use your readyboost.
https://support.microsoft.com/en-us/topic/usb-a....
Incase you are unable to access ReadyBoost tab in the properties, it is possible that it is not supported in that particular drive or other factors may affect it. Please check if the formatted drive uses NTFS or Fat32 file system. The minimum space for ReadyBoost is 256mb, please make sure that the space is free as it is already in the minimum requirements. You can also check if there is a security software in your device as it may flag it as security risk such as anti virus software, end point security, malware tools and others.
I hope this helps. Please let me know if I didn't address your problem. Don't hesitate to ask for further assistance.
Regards,
Arnel