Put a Cooldown on <Instant> notetagged skills

Is there a way to put instant skills after use to a cooldown, it can't seems to make a work and the skill keep being usable

You could always use these two plugins in tandem to apply a "cooldown" to the skill after use. I suggest watching the videos provided to get some insight about how to go about adapting the skills.

http://yanfly.moe/2015/10/13/yep-8-skill-core/
http://yanfly.moe/2015/10/14/yep-9-skill-cooldowns/

i assume you are using
http://yanfly.moe/2015/10/14/yep-9-skill-cooldowns/
http://yanfly.moe/2015/10/30/yep-22-instant-cast-2/

both these plugins work normally together in my project.
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another option allows you to cast and instant skill which then removes the instant trait from all skills until the next turn
allowing you to cast the same (or any instant) skill only twice per turn
this requires Battle Engine Core
<Instant>
<setup action>
add state x: user
</setup action>

make the state

remove at battle end
turn end: 1 turn
<Cancel Instant Skill: 1 to y>

x being the state number
y being the total number of all skills

I do have 2 of these plugins, but they won't play nice with each other. Saying Harlod use fire as instant, and he can't use it again for # amount of turns. Adding state is more troublesome thing and I just want to use cooldown to make it unusable for # of turns instead putting

all of yanfly's plugins are intended to work together - if they don't in your case, then you made a mistake in installing them, most likely put them into the wrong order, or using an older core version or something like that.

please give the full screenshot of the plugin manager - if that is all then you're missing at least one required plugin from yanfly's list, and we can't see which plugin versions you have used in that cropped screenshot.