I often tend to forget to log off um and I feel my profiles not safe is there anyway u can put a auto log off when like someone leaves the internet?

It's already there.

Log out and then log back in. On the log in page you will find a Remember me option. Uncheck that. Now when you shut down UM you should automatically be logged out.

Out of interest, why wouldn't your profile be safe if you forget to log off?

The only problem with this would be if you are logging on from a public location such as an internet cafe, if you don't log off then if the next person to use the machine visited the site then they would be logged on through your account. In general if you are using a public location to access the internet then it's always best to log out of any accounts before you go.