I have this domain jocurionline.li if ia wanna add to my host ( i already have there freeonlinegames.li ) what i most 2 do ?

Point the domain to the nameservers that your host has given.
Most probably they would look like :

nsX.sample-domain.com
nsY.sample-domain.com

Now login to your host's control panel (i'm taking cPanel here).
And add your domain 'jocurionline.li' to your hosting account using the 'Addon Domains' feature.

Now wait for a couple of hours for DNS to fully propagate.
Thats it.

oki i'll wite thx :*