like it says I have one sp and can spend it so I try to spend it on something like lets say +5 allure so I click that but when I press ok, the allure doesn't go up. When I click back to sp it is just selected on the +5 allure and...yeah
A skill is enabled by either equipping the accessory with the skill or spending SP to enable it.
You probably already have the silver pendant equipped with the "Allure +5" skill when you are trying to enable it.
Try unequipping the silver pendant and let me know if this makes any difference if you enable or disable the skill.