Ultimo as server outside home network ?

go through the steps (there is a tutorial about how to set up a dyndns account on their site) choose a good host name.
then choose a non default port.. i.e : 9995 , in your router. look for port forwarding in your router.
in your .cfg file put the port you opened in router to LISTEN TO PORT: 9995
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with your host write a cline : C: thijss.dyndns.org 9995 user1 pass1 no { 0:0:2 } respecting all the spaces between each part.
Cline is which you give to your peer.
then under this cline you write in .cfg you write the Fline which you keep in your .cfg : F: user1 pass1 2 0 0 { 0:0:2 } again respecting all spacings..
All of these, port, etc are only examples,,, you decide yours..
The only difference to your internal network is the host takes place of the internal IP ,, and you need to open a port for serving..
there are a few ways to keep your host synchronised with the changing of IP ,,on the dyndns page you can download the updater for pc ,for example..

hmmm, I always used Dyndns which I never paid for with the condition of refreshing it within a 30 day gap..
I have always read of compatibility probs with no-ip,, perhaps this has been sorted by now..
Of course this is a personal choice, and as I have never needed or used no-ip I cant tell you more..
I don´t think dyndns charge a lot ,,perhaps 20€ per year.. (as yo tell I haven¨t been near it in a long time)

Quote from thijss

okay,trying to setup free no-ip at the moment would i have to have my pc running all the time for my ip to update on the account ?

You don't need to have you PC running..., in most routers you can configure it to update no-ip accounts, look for it inside you router.