As I subscribed for a host, at least for a while... I was looking for more options...

...how do you renew the subscription to existing server or servers? Or will there be a prompt box to do that?

About 2 weeks before end of current subscription you'll get an email about renewing and besides server name in hosting you'll get the option to renew.

Quote from Eclipsed :

About 2 weeks before end of current subscription you'll get an email about...

All good! I was thinking that it would be something like that as it was indeed mentioned in same fashion once I rent a server... I guess I was thinking it a bit too far, although reasonably for having such option on the go.