How to deauthorize other devices with my account? [URGENT]

[✪ rdg]

So I gave my old Acer laptop to my cousin just like minutes ago but I had Steam still logged in my account, while my cousin is on his way to his house to use his new laptop for games how can I disable it manually? (or basically any other way to deauthorize that laptop)

This is urgent so please reply quick, I dont want my cousin to mess around with my stuff because he is new to Steam. Thanks to whoever helps.

[XBL Laberbacke]

https://store.steampowered.com/account/managedevices

[Snapjak]

http://store.steampowered.com/twofactor/manage

Deauthorize all other...

[БМВИСТА]

Steam > Settings > Manage Steam Guard Account Security and select deauthorize

[✪ rdg]

Originally posted by XBL Laberbacke:

https://store.steampowered.com/account/managedevices

Thanks man your a life saver.

[XBL Laberbacke]

Originally posted by ✪ RDG:

Originally posted by XBL Laberbacke:

https://store.steampowered.com/account/managedevices

Thanks man your a life saver.

Do you really think so badly of your cousin?

[✪ rdg]

Originally posted by XBL Laberbacke:

Originally posted by ✪ RDG:

Thanks man your a life saver.

Do you really think so badly of your cousin?

He would always prank me with a lot of stuff.

Of course I don't want my cousin to change my profile settings into some of his interests.